74VCXH245/D [ETC]
74VCXH245 ;
ETC 
74VCXH245
Low−Voltage 1.8/2.5/3.3V
8−Bit Transceiver
(3-State, Non-Inverting with Bushold)
The 74VCXH245 is an advanced performance, non-inverting 8-bit
transceiver. It is designed for very high-speed, very low-power
operation in 1.8 V, 2.5 V or 3.3 V systems.
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The 74VCXH245 is designed as a byte control. The
Transmit/Receive (T/Rn) inputs determine the direction of data flow
through the bi- directional transceiver. Transmit (active- HIGH)
enables data from A ports to B ports; Receive (active-LOW) enables
data from B to A ports. The Output Enable input (OE), when HIGH,
disables both A and B ports by placing them in a HIGH Z condition.
The data inputs include active bushold circuitry, eliminating the need
for external pull-up resistors to hold unused or floating inputs at a
valid logic state.
MARKING
DIAGRAMS
(Top View)
1 20
VCXH
245
ALYW
DQFN
SUFFIX TBD
CASE 485AA
• Designed for Low Voltage Operation: V = 1.65-3.6 V
CC
• High Speed Operation: 3.5 ns max for 3.0 to 3.6 V
4.2 ns max for 2.3 to 2.7 V
A
= Assembly Location
= Wafer Lot
= Year
WL
YY
WW
8.4 ns max for 1.65 to 1.95 V
• Static Drive: ±24 mA Drive at 3.0 V
±18 mA Drive at 2.3 V
= Work Week
±6 mA Drive at 1.65 V
• Includes Active Bushold to Hold Unused or Floating Data Inputs at a
Valid Logic State
• Near Zero Static Supply Current in All Three Logic States (20 mA)
Substantially Reduces System Power Requirements
• Latchup Performance Exceeds ±200 mA @ 85°C
• ESD Performance: Human Body Model >2000 V; Machine Model >200 V
Semiconductor Components Industries, LLC, 2003
1
Publication Order Number:
April, 2003 - Rev. 7
74VCXH245/D
74VCXH245
OE 19
T/R 1
19
12
11
10
20
2
3
4
5
6
7
DQFN
A0
A1
A2
A3
A4
A5
A6
A7
PIN #1
18
17
16
15
14
13
12
11
B0
B1
B2
B3
B4
B5
B6
B7
2
9
Figure 1. Pinout (Top View)
PIN NAMES
PINS
FUNCTION
OE
T/R
Output Enable Input
Transmit/Receive Input
A0-A7
B0-B7
Side A Bushold Inputs or 3-State Outputs
Side B Bushold Inputs or 3-State Outputs
TRUTH TABLE
INPUTS
OPERATING MODE
Non-Inverting
8
9
OE
T/R
L
L
L
H
X
B Data to A Bus
A Data to B Bus
Z State
H
H = High Voltage Level
L = Low Voltage Level
Z = High Impedance State
X = High or Low Voltage Level and Transitions are Acceptable
Figure 2. Logic Diagram
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2
74VCXH245
ABSOLUTE MAXIMUM RATINGS*
Symbol
Parameter
Value
Condition
Unit
V
V
V
V
DC Supply Voltage
DC Input Voltage
-0.5 to + 4.6
-0.5 ≤ V ≤ V + 0.5
CC
V
I
I
CC
DC Output Voltage
-0.5 ≤ V ≤ V + 0.5
Note 1
V
O
O
CC
I
I
DC Input Diode Current
DC Output Diode Current
-50
V < GND
mA
mA
mA
mA
mA
mA
°C
IK
I
-50
V < GND
O
OK
+50
V > V
O CC
I
I
I
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
Storage Temperature Range
±50
O
±100
±100
CC
GND
T
-65 to +150
STG
* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or
conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute-maximum-rated conditions
is not implied.
1. I absolute maximum rating must be observed.
O
RECOMMENDED OPERATING CONDITIONS**
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
Operating
Data Retention Only
1.65
1.2
3.3
3.3
3.6
3.6
V
V
V
Input Voltage
-0.3
0
V
CC
V
CC
V
V
I
Output Voltage
O
I
I
I
I
I
I
HIGH Level Output Current, V = 3.0 V - 3.6 V
-24
24
-18
18
-6
mA
mA
mA
mA
mA
mA
°C
OH
CC
LOW Level Output Current, V = 3.0 V - 3.6 V
OL
OH
OL
OH
OL
CC
HIGH Level Output Current, V = 2.3 V - 2.7 V
CC
LOW Level Output Current, V = 2.3 V - 2.7 V
CC
HIGH Level Output Current, V = 1.65 V - 1.95 V
CC
LOW Level Output Current, V = 1.65 V - 1.95 V
6
CC
T
Operating Free-Air Temperature
-40
0
+85
10
A
Dt/DV
Input Transition Rise or Fall Rate, V from 0.8 V to 2.0 V, V = 3.0 V
ns/V
IN
CC
**Floating or unused control inputs must be held HIGH or LOW.
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3
74VCXH245
DC ELECTRICAL CHARACTERISTICS
T
A
= -40°C to +85°C
Min
0.65 x V
1.6
Max
Symbol
Characteristic
Condition
Unit
V
IH
HIGH Level Input Voltage (Note 2)
1.65 V ≤ V < 1.95 V
V
CC
CC
2.3 V ≤ V ≤ 2.7 V
CC
2.7 V < V ≤ 3.6 V
2.0
CC
V
V
LOW Level Input Voltage (Note 2)
HIGH Level Output Voltage
1.65 V ≤ V < 1.95 V
0.35 x V
0.7
V
V
IL
CC
CC
2.3 V ≤ V ≤ 2.7 V
CC
2.7 V < V ≤ 3.6 V
0.8
CC
1.65 V ≤ V ≤ 3.6 V; I
= -100 mA
V
CC
- 0.2
OH
CC
OH
V
= 1.65 V; I
= -6 mA
= -6 mA
1.25
CC
OH
OH
V
= 2.3 V; I
2.0
1.8
1.7
2.2
2.4
2.2
CC
CC
CC
CC
CC
CC
V
V
V
V
V
= 2.3 V; I
= 2.3 V; I
= 2.7 V; I
= 3.0 V; I
= 3.0 V; I
= -12 mA
= -18 mA
= -12 mA
= -18 mA
= -24 mA
OH
OH
OH
OH
OH
V
LOW Level Output Voltage
1.65 V ≤ V ≤ 3.6 V; I = 100 mA
0.2
0.3
V
OL
CC
OL
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 1.65 V; I = 6 mA
OL
= 2.3 V; I = 12 mA
0.4
OL
= 2.3 V; I = 18 mA
0.6
OL
= 2.7 V; I = 12 mA
0.4
OL
= 3.0 V; I = 18 mA
0.4
OL
= 3.0 V; I = 24 mA
0.55
±5.0
OL
I
I
Input Leakage Current
V
IN
= V or GND; V = 3.6 V
mA
mA
I
CC
CC
Minimum Bushold Input Current
V
CC
V
CC
V
CC
V
CC
= 3.0 V, V = 0.8 V
75
-75
I(HOLD)
IN
= 3.0 V, V = 2.0 V
IN
= 2.3 V, V = 0.7 V
45
IN
= 2.3 V, V = 1.6 V
-45
IN
V
V
= 1.65 V, V = 0.57 V
25
CC
IN
= 1.65 V, V = 1.07 V
-25
CC
IN
I
Minimum Bushold Over-Drive
Current Needed to Change State
V
= 3.6 V, (Note 3)
= 3.6 V, (Note 4)
= 2.7 V, (Note 3)
= 2.7 V, (Note 4)
= 1.95 V, (Note 3)
= 1.95 V, (Note 4)
450
-450
300
-300
200
-200
mA
I(OD)
CC
CC
CC
CC
CC
CC
V
V
V
V
V
I
I
3-State Output Current
V
= V or GND; V = 3.6 V;
±10
mA
OZ
O
CC
CC
V = V or V
I
IH
IL
Quiescent Supply Current (Note 5)
1.65 V ≤ V ≤ 3.6 V; V = GND or V
20
mA
mA
CC
CC
I
CC
DI
Increase in I per Input
2.7 V < V ≤ 3.6 V; V = V - 0.6 V
CC
750
CC
CC
CC
IH
2. These values of V are used to test DC electrical characteristics only.
I
3. An external driver must source at least the specified current to switch from LOW-to-HIGH.
4. An external driver must sink at least the specified current to switch from HIGH-to-LOW.
5. Outputs disabled or 3-state only.
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4
74VCXH245
AC CHARACTERISTICS (Note 6; tR = tF = 2.0 ns; CL = 30 pF; RL = 500 W)
Limits
T
A
= -40°C to +85°C
V
CC
= 3.0 V to 3.6 V
V
CC
= 2.3 V to 2.7 V
V
CC
= 1.65 V to1.95 V
Min
Max
Min
Max
Min
1.5
Max
Symbol
Parameter
Waveform
Unit
t
Propagation Delay
Input to Output
1
0.6
0.6
3.5
3.5
0.8
0.8
4.2
4.2
8.4
8.4
ns
PLH
PHL
t
1.5
t
t
Output Enable Time to
High and Low Level
2
2
0.6
0.6
4.5
4.5
0.8
0.8
5.6
5.6
1.5
1.5
9.8
9.8
ns
ns
ns
PZH
PZL
t
t
Output Disable Time From
High and Low Level
0.6
0.6
3.6
3.6
0.8
0.8
4.0
4.0
1.5
1.5
7.2
7.2
PHZ
PLZ
t
t
Output-to-Output Skew
(Note 7)
0.5
0.5
0.5
0.5
0.75
0.75
OSHL
OSLH
6. For C = 50 pF, add approximately 300 ps to the AC maximum specification.
L
7. 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
guaranteed by design.
) or LOW-to-HIGH (t
); parameter
OSHL
OSLH
DYNAMIC SWITCHING CHARACTERISTICS
T
A
= +25°C
Typ
0.3
Symbol
Characteristic
Condition
= 1.8 V, C = 30 pF, V = V , V = 0 V
Unit
V
OLP
V
OLV
V
OHV
Dynamic LOW Peak Voltage
(Note 8)
V
V
CC
L
IH
CC
IL
V
V
V
V
V
V
V
V
= 2.5 V, C = 30 pF, V = V , V = 0 V
0.7
CC
CC
CC
CC
CC
CC
CC
CC
L
IH
CC
IL
= 3.3 V, C = 30 pF, V = V , V = 0 V
1.0
L
IH
CC
IL
Dynamic LOW Valley Voltage
(Note 8)
= 1.8 V, C = 30 pF, V = V , V = 0 V
-0.3
-0.7
-1.0
1.3
V
V
L
IH
CC
IL
= 2.5 V, C = 30 pF, V = V , V = 0 V
L
IH
CC
IL
= 3.3 V, C = 30 pF, V = V , V = 0 V
L
IH
CC
IL
Dynamic HIGH Valley Voltage
(Note 9)
= 1.8 V, C = 30 pF, V = V , V = 0 V
L IH CC IL
= 2.5 V, C = 30 pF, V = V , V = 0 V
1.7
L
IH
CC
IL
= 3.3 V, C = 30 pF, V = V , V = 0 V
2.0
L
IH
CC
IL
8. Number of outputs defined as “n”. Measured with “n-1” outputs switching from HIGH-to-LOW or LOW-to-HIGH. The remaining output is
measured in the LOW state.
9. Number of outputs defined as “n”. Measured with “n-1” outputs switching from HIGH-to-LOW or LOW-to-HIGH. The remaining output is
measured in the HIGH state.
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Input Capacitance
Condition
Note 10
Typical
Unit
pF
C
C
C
6
7
IN
Output Capacitance
Note 10
pF
OUT
PD
Power Dissipation Capacitance
Note 10, 10 MHz
20
pF
10.V = 1.8, 2.5 or 3.3 V; V = 0 V or V .
CC
CC
I
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5
74VCXH245
V
IH
Vm
Vm
An, Bn
Bn, An
0 V
t
t
PHL
PLH
V
OH
OL
Vm
Vm
V
WAVEFORM 1 − PROPAGATION DELAYS
= t = 2.0 ns, 10% to 90%; f = 1 MHz; t = 500 ns
t
R
F
W
V
IH
Vm
Vm
OEn, T/Rn
0 V
t
t
PHZ
PZH
V
OH
Vy
Vm
Vm
An, Bn
An, Bn
≈ 0V
t
t
PLZ
PZL
≈ V
CC
Vx
V
OL
WAVEFORM 2 − OUTPUT ENABLE AND DISABLE TIMES
= t = 2.0 ns, 10% to 90%; f = 1 MHz; t = 500 ns
t
R
F
W
Figure 3. AC Waveforms
V
CC
3.3 V ± 0.3 V
2.5 V ± 0.2 V
1.8 V ± 0.15 V
Symbol
V
2.7 V
1.5 V
V
V
CC
IH
CC
V
V
CC
/2
V
CC
/2
m
V
V
+ 0.3 V
- 0.3 V
V
+ 0.15 V
- 0.15 V
V
+ 0.15 V
- 0.15 V
x
OL
OL
OL
V
y
V
OH
V
OH
V
OH
V
CC
6 V or V × 2
CC
OPEN
R
L
PULSE
GENERATOR
GND
DUT
R
T
C
L
R
L
TEST
SWITCH
t
t
, t
Open
PLH PHL
, t
6 V at V = 3.3 ± 0.3 V;
CC
× 2 at V = 2.5 ± 0.2 V; 1.8 V ± 0.15 V
PZL PLZ
V
CC
CC
t
, t
GND
PZH PHZ
C = 30 pF or equivalent (Includes jig and probe capacitance)
L
R = 500 W or equivalent
L
R
T
= Z
of pulse generator (typically 50 W)
OUT
Figure 4. Test Circuit
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6
74VCXH245
PACKAGE DIMENSIONS
DQFN
SUFFIX TBD
CASE 485AA-01
ISSUE O
NOTES:
D
A
B
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSIONS b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.25 AND 0.30 MM FROM TERMINAL.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
PIN ONE REFERENCE
MILLIMETERS
DIM MIN
MAX
1.00
0.05
0.75
A
A1
A2
A3
b
0.80
0.00
0.65
0.20 REF
0.20
E
0.30
1.15
D
2.50 BSC
D2
E
0.85
4.50 BSC
2X
E2
e
1.85
0.50 BSC
2.15
0.15
C
2X
K
0.20
0.35
−−−
0.45
L
0.15
C
0.10
C
C
A2
A
SEATING
PLANE
0.08
20X
(A3)
e
A1
C
D2
11
20X L
9
12
e
E2
20X
b
20X
K
19
2
0.10 C A B
0.05
1
C
NOTE 3
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7
74VCXH245
X
max
= 0.28
Pitch
0.5
0.65
1.45
2.8
3.45
4.80
All Dimensions in mm.
Figure 5. 20 Pad DQFN Suggested Board Layout (Bottom View)
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changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
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74VCXH245/D
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