SN75C08 Datasheet, PDF (1/7 Pages) Texas Instruments – SCSI INPUT/OUTPUT BUFFER

• Single-Ended Driver for Request Line With
Improved Characteristics
• Single-Ended Receiver for ACKNOWLEDGE
Line With Improved Characteristics
• Controlled Driver Rise and Fall Times
10 ns Typ
• High Receiver Input Hysteresis
600 mV Typ
• Receiver Input Noise Pulse Filter
2.5 ns Max
• Request and Acknowledge Meet
ANSI X3.131-1986 (SCSI)
• Packaged in Thin Shrink-Small-Outline
Package With 25-mil Pin Pitches
• Designed to Operate at 5 Million Transfers
Per Second
• Power Up/Down Glitch Protection
• High Impedance With V_CC = 0 V
description
The SN75C08 is an input/output SCSI buffer with
eight channels. One channel, REQ (request), is an
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.
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.
The SN75C08 is characterized for operation from
0°C to 70°C.
SN75C08
SCSI INPUT/OUTPUT BUFFER
SLLS153 – D4067, JANUARY 1993
DB PACKAGE
(TOP VIEW)
1G ₁
DA1 ₂
RY1 ₃
DA2 ₄
RY2 ₅
DA3 ₆
RY3 ₇
ACK IN 8
REQ OUT 9
GND 10
20 ^V_DD
19 ^2G
18 ^DY1
17 ^RA1
16 ^DY2
15 ^RA2
14 ^DY3
13 RA3
12 ACK OUT
11 REQ IN
Function Tables
DRIVER 1 TO 3
INPUTS
1G DA
OUTPUT
DY
HH
H
H
L
L
L
H
Z
L
L
Z
RECEIVER 1 TO 3
INPUTS
2G DA
OUTPUT
RY
HH
Z
H
L
Z
L
H
H
L
L
L
ACKNOWLEDGE
INPUTS
1G ACK IN
OUTPUT
ACK OUT
H
H
Z
H
L
Z
L
H
H
L
L
L
REQUEST
INPUTS
OUTPUT
2G REQ IN REQ OUT
H
H
H
H
L
L
L
H
H
L
L
H
H = high level, L = low level,
Z = high impedance
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1993, Texas Instruments Incorporated
1