SN74ALVCH16901
18-BIT UNIVERSAL BUS TRANSCEIVER
WITH PARITY GENERATORS/CHECKERS
SCES010E – JULY 1995 – REVISED FEBRUARY 1999
DGG PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus+ Family
EPIC (Enhanced-Performance Implanted
CMOS) Submicron Process
1CLKENAB
LEAB
CLKAB
1ERRA
1APAR
GND
1CLKENBA
LEBA
CLKBA
1ERRB
1BPAR
GND
1B1
1B2
1B3
1
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33
2
UBT (Universal Bus Transceiver)
Combines D-Type Latches and D-Type
Flip-Flops for Operation in Transparent,
Latched, or Clocked Mode
3
4
5
6
Simultaneously Generates and Checks
Parity
1A1
1A2
1A3
7
8
9
Option to Select Generate Parity and Check
or Feed-Through Data/Parity in A-to-B or
B-to-A Directions
V
V
10
11
12
13
14
15
16
17
18
19
20
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22
23
24
25
26
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32
CC
CC
1A4
1A5
1A6
GND
1A7
1A8
2A1
2A2
GND
2A3
2A4
2A5
1B4
1B5
1B6
GND
1B7
1B8
2B1
2B2
GND
2B3
2B4
2B5
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Latch-Up Performance Exceeds 250 mA Per
JESD 17
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
Packaged in Thin Shrink Small-Outline
Package
V
V
CC
CC
description
2A6
2A7
2A8
2B6
2B7
2B8
GND
2BPAR
2ERRB
OEBA
ODD/EVEN
2CLKENBA
This 18-bit (dual-octal) noninverting registered
transceiver is designed for 1.65-V to 3.6-V V
operation.
CC
GND
2APAR
2ERRA
OEAB
SEL
TheSN74ALVCH16901 is a dual 9-bit to dual 9-bit
parity transceiver with registers. The device can
operate as a feed-through transceiver or it can
generate/check parity from the two 8-bit data
buses in either direction.
2CLKENAB
The SN74ALVCH16901 features independent clock (CLKAB or CLKBA), latch-enable (LEAB or LEBA), and
dual 9-bit clock-enable (CLKENAB or CLKENBA) inputs. It also provides parity-enable (SEL) and parity-select
(ODD/EVEN) inputs and separate error-signal (ERRA or ERRB) outputs for checking parity. The direction of
data flow is controlled by OEAB and OEBA. When SEL is low, the parity functions are enabled. When SEL is
high, the parity functions are disabled and the device acts as an 18-bit registered transceiver.
To ensure the high-impedance state during power up or power down, OE should be tied to V through a pullup
CC
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN74ALVCH16901 is characterized for operation from –40°C to 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus+, EPIC, and UBT are trademarks of Texas Instruments Incorporated.
Copyright 1999, 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.
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