74VCXH2245WMX [FAIRCHILD]
Single 8-bit Bus Transceiver ; 一个8位总线收发器\n
| 型号： | 74VCXH2245WMX |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Single 8-bit Bus Transceiver
|
| 文件： | 总8页 (文件大小：86K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1999
Revised July 1999
74VCXH2245
Low Voltage Bidirectional Transceiver with Bushold
and 26Ω Series Resistors in B Outputs
General Description
Features
The VCXH2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus ori-
ented applications. The T/R input determines the direction
of data flow. The OE input disables both the A and B Ports
by placing them in a high impedance state. The VCXH2245
data inputs include active bushold circuitry, eliminating the
need for external pull-up resistors to hold unused or float-
ing data inputs at a valid logic level.
■ 1.65V-3.6V VCC supply operation
■ 3.6V tolerant control inputs
■ Bushold on data inputs eliminates the need for external
pull-up/pull-down resistors
■ 26Ω series resistors in B Port outputs
■ tPD (A to B)
4.4 ns max for 3.0V to 3.6V VCC
5.6 ns max for 2.3V to 2.7V VCC
9.8 ns max for 1.65V to 1.95V VCC
■ Static Drive (IOH/IOL B outputs):
±12 mA @ 3.0V VCC
The 74VCXH2245 is designed for low voltage (1.65V to
3.6V) VCC applications. The VCXH2245 is also designed
with 26Ω series resistance in the B Port outputs. This
design reduces line noise in applications such as memory
address drivers, clock drivers, and bus transceivers trans-
mitters
±8 mA @ 2.3V VCC
The 74VCXH2245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while main-
taining low CMOS power dissipation.
±3 mA @ 1.65V VCC
■ Uses patented Quiet Series noise/EMI reduction
circuitry
■ Latchup performance exceeds 300 mA
■ ESD performance:
Human body model > 2000V
Machine model > 200V
Ordering Code:
Order Number
74VCXH2245WM
74VCXH2245MTC
Package Number
M20B
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MTC20
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
Quiet Series is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation
ds500199
www.fairchildsemi.com
Pin Descriptions
Truth Table
Inputs
Pin Names
Description
Outputs
OE T/R
OE
Output Enable Input (Active LOW)
Transmit/Receive Input
L
L
L
H
X
Bus B0–B7 Data to Bus A0–A7
Bus A0–A7 Data to Bus B0–B7
HIGH Z State on A0–A7, B0–B7
T/R
A0–A7
B0–B7
Side A Bushold Inputs or 3-STATE Outputs
Side B Bushold Inputs or 3-STATE Outputs
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Logic Diagram
www.fairchildsemi.com
2
Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 3)
Supply Voltage (VCC
)
−0.5V to +4.6V
DC Input Voltage (VI)
Power Supply Voltage (VCC
)
−0.5V to 4.6 V
Operating
1.65V to 3.6V
1.2V to 3.6V
−0.3V to VCC
0V to VCC
T/R, OE
Data Retention Only
Input Voltage
I/O Ports
−0.5V to VCC + 0.5V
−0.5V to VCC + 0.5V
−50 mA
DC Output Voltage (VO)(Note 2)
DC Input Diode Current (IIK) VI < 0V
Output Voltage (VO)
Output Current in IOH/IOL - A Outputs
DC Output Diode Current (IOK
)
V
V
V
CC = 3.0V to 3.6V
CC = 2.3V to 2.7V
CC = 1.65V to 2.3V
±24 mA
±18 mA
±6 mA
V
V
O < 0V
−50 mA
+50 mA
±50 mA
O > VCC
DC Output Source/Sink Current
(IOH/IOL
Output Current in IOH/IOL - B Outputs
)
V
V
V
CC = 3.0V to 3.6V
CC = 2.3V to 2.7V
CC = 1.65V to 2.3V
± 12 mA
± 8 mA
DC VCC or Ground Current
Storage Temperature (TSTG
±100 mA
)
−65°C to +150°C
± 3 mA
Free Air Operating Temperature (TA)
−40°C to +85°C
Minimum Input Edge Rate (∆t/∆V)
VIN = 0.8V to 2.0V, VCC = 3.0V
10 ns/V
Note 1: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated
at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recom-
mended Operating Conditions” table will define the conditions for actual device operation.
Note 2: I Absolute Maximum Rating must be observed.
O
Note 3: Floating or unused control inputs must be held HIGH or LOW.
DC Electrical Characteristics (2.7V < V ≤ 3.6V)
CC
V
CC
Symbol
Parameter
Conditions
Min
Max
Units
(V)
2.7–3.6
2.7–3.6
2.7–3.6
2.7
V
V
V
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
A Outputs
2.0
V
V
IH
0.8
IL
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
= −100 µA
V
− 0.2
CC
OH
OH
OH
OH
OH
OH
OH
OH
OH
OL
OL
OL
OL
OL
OL
OL
OL
= −12 mA
= −18 mA
= −24 mA
= −100 µA
= −6 mA
= −8 mA
= −12 mA
= 100 µA
= 12 mA
= 18 mA
= 24 mA
= 100 µA
= 6 mA
2.2
2.4
2.2
V
V
V
V
3.0
3.0
HIGH Level Output Voltage
B Outputs
2.7–3.6
2.7
V
–0.2
CC
2.2
2.4
2.2
3.0
3.0
V
LOW Level Output Voltage
A Outputs
2.7–3.6
2.7
0.2
0.4
OL
3.0
0.4
3.0
0.55
0.2
LOW Level Output Voltage
B Outputs
2.7–3.6
2.7
0.4
= 8 mA
3.0
0.55
0.8
= 12 mA
3.0
I
Input Leakage Current
Bushold Input Minimum
Drive Hold Current
V
V
V
= V or GND
2.7–3.6
3.0
±5.0
µA
µA
I
IN
IN
IN
CC
I
= 0.8V
= 2.0V
75
−75
450
−450
I(HOLD)
3.0
I
Bushold Input Over-Drive
Current to Change State
3-STATE Output Leakage
Quiescent Supply Current
(Note 4)
(Note 5)
3.6
I(OD)
µA
3.6
I
V
= V or GND V = V or V
IL
2.7–3.6
2.7–3.6
2.7–3.6
±10
20
µA
µA
µA
OZ
O
CC
I
IH
I
V = V or GND
CC
I
CC
∆I
Increase in I per Input
V
= V −0.6V
750
CC
CC
IH
CC
Note 4: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 5: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
3
www.fairchildsemi.com
DC Electrical Characteristics (2.3V ≤ V ≤ 2.7V)
CC
V
CC
Symbol
Parameter
Conditions
Min
Max
Units
(V)
2.3–2.7
2.3–2.7
2.3–2.7
2.3
V
V
V
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
A Outputs
1.6
V
V
IH
0.7
IL
I
= −100 µA
V
− 0.2
CC
OH
OH
I
= −6 mA
= −12 mA
= −18 mA
= −100 µA
= −4 mA
= −6 mA
= −8mA
2.0
1.8
1.7
OH
V
V
I
2.3
OH
I
2.3
OH
HIGH Level Output Voltage
B Outputs
I
2.3–2.7
2.3
V
–2
OH
CC
I
2.0
OH
I
2.3
1.8
1.7
OH
I
2.3
OH
V
LOW Level Output Voltage
A Outputs
I
= 100 µA
= 12 mA
= 18 mA
= 100 µA
= 6 mA
2.3–2.7
2.3
0.2
0.4
0.6
0.2
0.4
0.6
±5.0
OL
OL
I
V
V
OL
I
2.3
OL
LOW Level Output Voltage
B Outputs
I
2.3–2.7
2.3
OL
I
OL
I
= 8 mA
2.3
OL
I
I
Input Leakage Current
Bushold Input Minimum
Drive Hold Current
V
V
V
= V or GND
2.3–2.7
2.3
µA
µA
I
IN
IN
IN
CC
= 0.7V
= 1.6V
45
I(HOLD)
I(OD)
OZ
2.3
−45
300
I
I
I
Bushold Input Over−Drive
Current to Change State
3-STATE Output Leakage
(Note 6)
(Note 7)
2.7
µA
µA
2.7
−300
V
= V or GND
2.3–2.7
±10
O
CC
V = V or V
IL
I
IH
Quiescent Supply Current
V = V or GND
2.3–2.7
20
µA
CC
I
CC
Note 6: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 7: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
DC Electrical Characteristics (1.65V ≤ V < 2.3V)
CC
V
CC
Symbol
Parameter
Conditions
Min
Max
Units
(V)
1.65–2.3
1.65–2.3
1.65–1.95
1.65
V
V
V
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
A Outputs
0.65 x V
V
V
IH
CC
0.35 x V
IL
CC
I
= −100 µA
V
− 0.2
CC
OH
OH
V
V
V
I
= −6 mA
= −100 µA
= −3 mA
= 100 µA
= 6 mA
1.25
V –0.2
CC
OH
HIGH Level Output Voltage
B Outputs
I
1.65–2.3
1.65
OH
I
1.25
OH
V
LOW Level Output Voltage
A Outputs
I
1.65–2.3
1.65
0.2
0.3
OL
OL
I
OL
LOW Level Output Voltage
B Outputs
I
= 100µA
= 3 mA
1.65–2.3
1.65
0.2
OL
V
I
0.3
OL
I
I
Input Leakage Current
Bushold Input Minimum
Drive Hold Current
0 ≤ V ≤ 3.6V
1.65–2.3
1.65
±5.0
µA
µA
I
I
V
V
= 0.57V
= 1.07V
25
−25
200
−200
I(HOLD)
IN
IN
1.65
I
Bushold Input Over-Drive
Current to Change State
3-STATE Output Leakage
Quiescent Supply Current
(Note 8)
(Note 9)
1.95
I(OD)
µA
1.95
I
I
V
= V or GND
1.65–2.3
1.65–2.3
±10
µA
µA
OZ
CC
O
CC
V = V or GND
20
I
CC
Note 8: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 9: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
www.fairchildsemi.com
4
AC Electrical Characteristics (Note 10)
T
= −40°C to +85°C, C = 30 pF, R = 500Ω
A
L
L
Symbol
Parameter
V
= 3.3V ± 0.3V
V
= 2.5V ± 0.2V
V = 1.8V ± 0.15V
CC
Units
CC
CC
Min
Max
Min
Max
Min
Max
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Propagation Delay,
PHL
0.6
4.4
3.5
5.0
4.5
4.2
3.6
0.5
0.8
5.6
1.5
9.8
ns
ns
ns
ns
ns
ns
ns
A to B
PLH
PHL
PLH
PZL
Propagation Delay,
B to A
0.6
0.6
0.6
0.6
0.6
0.8
0.8
0.8
0.8
0.8
4.2
6.6
5.6
4.7
4.0
0.5
1.5
1.5
1.5
1.5
1.5
8.4
9.8
9.8
8.5
7.2
0.75
Output Enable Time,
A to B
PZH
PZL
Output Enable Time,
B to A
PZH
PLZ
Output Disable Time,
A to B
PHZ
PLZ
Output Disable Time,
B to A
PHZ
OSHL
OSLH
Output to Output Skew
(Note 11)
Note 10: For C = 50 pF, add approximately 300 ps to the AC maximum specification.
L
Note 11: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
) or LOW-to-HIGH (t
).
OSLH
OSHL
Dynamic Switching Characteristics
T
= 25°C
A
V
(V)
CC
Symbol
Parameter
Conditions
= 30 pF, V = V , V = 0V
Units
Typical
0.3
V
V
V
Quiet Output Dynamic Peak V
B to A
,
,
C
C
C
C
C
C
1.8
2.5
3.3
1.8
2.5
3.3
1.8
2.5
3.3
1.8
2.5
3.3
1.8
2.5
3.3
1.8
2.5
3.3
OLP
OL
L
L
L
L
L
L
IH
CC
IL
0.7
V
1.0
Quiet Output Dynamic Peak V
A to B
= 30 pF, V = V , V = 0V
0.2
OL
IH
CC
IL
0.45
0.65
−0.3
−0.7
−1.0
−0.2
−0.45
−0.65
1.3
V
V
V
V
V
Quiet Output Dynamic Valley V
B to A
,
= 30 pF, V = V , V = 0V
IH CC IL
OLV
OL
Quiet Output Dynamic Valley, V
A to B
,
= 30 pF, V = V , V = 0V
IH CC IL
OL
Quiet Output Dynamic Valley V
B to A
,
,
= 30 pF, V = V , V = 0V
IH CC IL
OHV
OH
1.7
2.0
Quiet Output Dynamic Valley V
A to B
= 30 pF, V = V , V = 0V
1.5
OH
IH
CC
IL
2.0
2.5
Capacitance
T
= +25°C
A
Symbol
Parameter
Conditions
V = 0V or V , V = 1.8V, 2.5V or 3.3V
Units
Typical
C
Input Capacitance
6
7
pF
pF
pF
IN
I
CC
CC
C
C
Input/Output Capacitance
V = 0V or V , V = 1.8V, 2.5V or 3.3V
I CC CC
I/O
PD
Power Dissipation Capacitance
V = 0V or V , f = 10 MHz, V = 1.8V, 2.5V or 3.3V
20
I
CC
CC
5
www.fairchildsemi.com
AC Loading and Waveforms
FIGURE 1. AC Test Circuit
TEST
SWITCH
Open
6V at V = 3.3 ± 0.3V;
t
, t
PLH PHL
t
, t
PZL PLZ
CC
V
x 2 at V = 2.5V ± 0.2V; 1.8V
CC
CC
± 0.15V
t
, t
GND
PZH PHZ
FIGURE 2. Waveform for Inverting and Non-inverting Functions
FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic
FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic
V
CC
Symbol
3.3V ± 0.3V
1.5V
2.5V ± 0.2V
1.8V ± 0.15V
V
V
V
/2
/2
V
V
/2
/2
mi
CC
CC
CC
CC
V
1.5V
mo
V
V
+ 0.3V
− 0.3V
V
+ 0.15V
− 0.15V
V
+ 0.15V
− 0.15V
x
y
OL
OL
OL
V
V
V
V
OH
OH
OH
www.fairchildsemi.com
6
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
Package Number M20B
7
www.fairchildsemi.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC20
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
www.fairchildsemi.com
8
相关型号：
©2020 ICPDF网 联系我们和版权申明