SN75C08 [TI]
SCSI INPUT/OUTPUT BUFFER; SCSI输入/输出缓冲器
| 型号： | SN75C08 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SCSI INPUT/OUTPUT BUFFER |
| 文件： | 总7页 (文件大小：90K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN75C08
SCSI INPUT/OUTPUT BUFFER
SLLS153 – D4067, JANUARY 1993
•
•
•
•
•
•
•
•
Single-Ended Driver for Request Line With
Improved Characteristics
DB PACKAGE
(TOP VIEW)
Single-Ended Receiver for ACKNOWLEDGE
Line With Improved Characteristics
1G
DA1
RY1
DA2
RY2
V
DD
2G
DY1
RA1
DY2
RA2
DY3
RA3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Controlled Driver Rise and Fall Times
10 ns Typ
High Receiver Input Hysteresis
600 mV Typ
DA3
RY3
Receiver Input Noise Pulse Filter
2.5 ns Max
ACK IN
REQ OUT
GND
Request and Acknowledge Meet
ANSI X3.131-1986 (SCSI)
ACK OUT
REQ IN
Packaged in Thin Shrink-Small-Outline
Package With 25-mil Pin Pitches
Function Tables
DRIVER 1 TO 3
Designed to Operate at 5 Million Transfers
Per Second
INPUTS
OUTPUT
DY
•
•
Power Up/Down Glitch Protection
1G
DA
H
H
L
H
L
H
L
High Impedance With V
= 0 V
CC
H
L
Z
Z
description
L
The SN75C08 is an input/output SCSI buffer with
eightchannels. Onechannel, REQ(request), isan
open-drain driver that includes controlled rise and
fall times to reduce crosstalk and RF emissions on
the SCSI bus. The device also has one channel,
ACK (acknowledge), that is a receiver that
typically exhibits 600 mV of hysteresis and a
2.5-ns pulse filter to reject noise for bus reflections
and/or other sources. The remaining channels
offer TTL inputs and 4-mA 3-state outputs.
RECEIVER 1 TO 3
INPUTS
2G DA
OUTPUT
RY
H
H
Z
Z
H
L
H
L
L
L
H
L
ACKNOWLEDGE
INPUTS
OUTPUT
1G ACK IN
ACK OUT
The enhancement to standard CMOS I/Os
provides fewer data errors and higher data
throughput with less noise emissions. The
switching speeds of the SN75C08 are sufficient to
transfer data over the data bus at five million
transfers per second. This device is available in
the space efficient shrink-small-outline package
(SSOP) with 25-mil pin pitch.
H
H
L
H
L
H
L
Z
Z
H
L
L
REQUEST
INPUTS OUTPUT
REQ IN
2G
REQ OUT
H
H
L
H
L
H
L
H
L
H
H
The SN75C08 is characterized for operation from
0°C to 70°C.
L
H = high level,
L = low level,
Z = high impedance
Copyright 1993, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75C08
SCSI INPUT/OUTPUT BUFFER
SLLS153 – D4067, JANUARY 1993
functional block diagram
19
1
2G
1G
17
15
13
18
16
14
12
2
3
5
7
RA1
RY1
RY2
RY3
DA1
DY1
4
DA2
DY2
RA2
RA3
6
DA3
DY3
8
ACK IN
ACK OUT
9
REQ OUT
11
REQ IN
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6 V
CC
Input voltage range V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
+ 0.5 V
+ 0.5 V
I
CC
CC
Output voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
O
Input clamp current, I (V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
I
I
O
I
CC
CC
Output clamp current, (V < 0 or V > V )
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
O
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Lead temperature 1,6 mm from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATING TABLE
POWER DISSIPATION
≤ 25°C
DERATING FACTOR
PACKAGE
T
ABOVE T ≥ 25°C
A
A
DB
612 mW
4.9 mW/°C
recommended operating conditions
MIN NOM
MAX
UNIT
Supply voltage, V
4.75
2
5
5.25
V
V
V
V
V
CC
High-level dc input voltage, V
1G, 2G, DA, REQ IN, RA
1G, 2G, DA, REQ IN, RA
1G, 2G, DA, REQ IN, RA
DY, RY, ACK OUT
DY, RY, ACK OUT
REQ OUT
IH
Low-level dc input voltage, V
IL
0.8
Input voltage, V
0
0
V
V
I
CC
Output voltage, V
O
CC
High-level output current, I
4
mA
OH
DY, RY, ACK OUT
REQ OUT
4
48
70
mA
mA
°C
Low-level output current, I
OL
Operating free-air temperature, T
0
A
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75C08
SCSI INPUT/OUTPUT BUFFER
SLLS153 – D4067, JANUARY 1993
ACK electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature
PARAMETER
Positive-going threshold voltage
Negative-going threshold voltage
TEST CONDITIONS
MIN
TYP
1.7
1.1
0.6
MAX
UNIT
V
V
V
V
V
V
T+
V
T–
Input hysteresis (V – V
T+
)
T–
V
hys
OH
OL
High-level output voltage
Low-level output voltage
Input current
I
I
= –4 mA,
= 4 mA,
V = 2 V
3.7
µA
V
OH
I
V = 0.8 V
I
0.5
±1
±5
OL
I
I
V = 0 V to V
CC
µA
µA
I
I
Output current disabled
V
= 0 V to V
O CC
OZ
ACK switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C = 50 pF (see Figure 1)
L
PARAMETER
TEST CONDITIONS
S1 and S2 open
S1 and S2 open
MIN
TYP
13
8
MAX
22
UNIT
ns
t
t
t
t
t
t
Propagation delay time, high-to-low-level output
Propagation delay time, low-to-high-level output
Enable time (of a 3-state output) to high level
Enable time (of a 3-state output) to low level
Disable time (of a 3-state output) from high level
Disable time (of a 3-state output) from low level
PHL
PLH
PZH
PZL
PHZ
PLZ
15
ns
R
R
R
R
= 1 kΩ,
= 1 kΩ,
= 1 kΩ,
= 1 kΩ,
S1 closed
S2 closed
S1 closed
S2 closed
7
14
ns
L
L
L
L
10
7
18
ns
14
ns
7
14
ns
REQ electrical characteristics over recommended operating free-air temperature range
PARAMETER
TEST CONDITIONS
= 48 mA
OL
MIN
MAX
UNIT
V
V
V
Low-level output voltage
Input threshold voltage
Input current
I
0.5
OL
1.3
V
T
I
I
V = 0 V to V
CC
±1
±5
µA
µA
I
I
Output current disabled
V = 0 V to V
O CC
OZ
REQ switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (see Figure 2)
PARAMETER
TEST CONDITIONS
MIN
TYP
15
MAX
25
UNIT
t
t
t
t
Propagation delay time, high-to-low-level output
Propagation delay time, low-to-high-level output
Propagation delay time, high-to-low-level output
Propagation delay time, low-to-high-level output
PHL
PLH
PHL
PLH
C
= 15 pF
ns
L
17
30
15
25
C
= 200 pF
ns
L
23
30
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75C08
SCSI INPUT/OUTPUT BUFFER
SLLS153 – D4067, JANUARY 1993
driver 1 to 3 and receiver 1 to 3 electrical characteristics over recommended ranges of supply
voltage and operating free-air temperature
PARAMETER
High-level output voltage
TEST CONDITIONS
MIN
MAX
UNIT
V
V
V
V
I
I
= –4 mA,
= 4 mA,
V = 2 V
3.7
OH
OL
T
OH
I
Low-level output voltage
Input threshold voltage
Input current
V = 0.8 V
I
0.5
V
OL
1.3
V
I
I
V = 0 V to V
CC
±1
±5
µA
µA
I
I
Output current disabled
V
= 0 V to V
O CC
OZ
driver 1 to 3 and receiver 1 to 3 switching characteristics over recommended ranges of supply
voltage and operating free-air temperature range, C = 50 pF (see Figure 1)
L
PARAMETER
TEST CONDITIONS
S1 and S2 open
S1 and S2 open
MIN
TYP
13
8
MAX
UNIT
ns
t
t
t
t
t
t
Propagation delay time, high-to-low-level output
Propagation delay time, low-to-high-level output
Enable time (of a 3-state output) to high level
Enable time (of a 3-state output) to low level
Disable time (of a 3-state output) from high level
Disable time (of a 3-state output) from low level
PHL
PLH
PZH
PZL
PHZ
PLZ
ns
R
R
R
R
= 1 kΩ,
= 1 kΩ,
= 1 kΩ,
= 1 kΩ,
S1 closed
S2 closed
S1 closed
S2 closed
7
ns
L
L
L
L
10
7
ns
ns
7
ns
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75C08
SCSI INPUT/OUTPUT BUFFER
SLLS153 – D4067, JANUARY 1993
PARAMETER MEASUREMENT INFORMATION
5 V
S1
R
L
Input
Output
S2
(see Note A)
C
L
(see Note B)
TEST CIRCUIT
t
f
t
f
t
r
t
r
V
V
CC
CC
90% 90%
44%
10%
90% 90%
44%
10%
Input
Input
44%
44%
10%
10%
0 V
0 V
t
t
t
t
PHL
PHZ
PLH
PZH
V
V
V
OH
OH
90%
Output
Output
Output
Output
1.3 V
1.3 V
1.3 V
1.3 V
V
Hi-Z
Hi-Z
OL
t
t
t
t
PLH
PLZ
PHL
PZL
OH
1.3 V
10%
1.3 V
V
V
OL
OL
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t ≤ 6 ns, t ≤ ns,
r
f
Z
= 50 Ω.
o
L
B. C includes probe and jig capacitance.
Figure 1. ACK, Driver 1 to 3 and Receiver 1 to 3 Test Circuit and Voltage Waveforms
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75C08
SCSI INPUT/OUTPUT BUFFER
SLLS153 – D4067, JANUARY 1993
PARAMETER MEASUREMENT INFORMATION
5 V
R1 = 110 Ω
Output
Input
(see Note A)
R2 = 165 Ω
C
L
(see Note B)
TEST CIRCUIT
t
f
t
r
V
CC
90% 90%
44%
10%
Input
44%
10%
0 V
t
t
PHL
PLH
V
OH
Output
Output
1.3 V
1.3 V
V
OL
t
t
PLH
PHL
V
OH
1.3 V
1.3 V
V
OL
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t ≤ 6 ns, t ≤ ns,
r
f
Z
= 50 Ω.
o
L
B. C includes probe and jig capacitance.
Figure 2. REQ Output Enable and Disable TIme Test Circuit and Voltage Waveforms
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
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the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are
utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each
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Copyright 1998, Texas Instruments Incorporated
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