SN74ALVCH16903
3.3-V 12-BIT UNIVERSAL BUS DRIVER
WITH PARITY CHECKER AND DUAL 3-STATE OUTPUTS
SCES095C – MARCH 1997 – REVISED MAY 1998
DGG, DGV, OR DL PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus Family
EPIC (Enhanced-Performance Implanted
CMOS) Submicron Process
OE
1Y1
1Y2
GND
2Y1
2Y2
CLK
1
56
2
55 1A
Checks Parity
3
54 11A/YERREN
Able to Cascade With a Second
SN74ALVCH16903
GND
4
53
5
52 11Y1
51 11Y2
6
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
V
7
50
V
CC
CC
3Y1
3Y2
4Y1
GND
4Y2
5Y1
5Y2
6Y1
6Y2
7Y1
GND
7Y2
8Y1
8Y2
8
49 2A
48 3A
9
Latch-Up Performance Exceeds 250 mA Per
JESD 17
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
4A
GND
12A
12Y1
12Y2
5A
6A
7A
GND
APAR
8A
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
Package Options Include Plastic 300-mil
Shrink Small-Outline (DL), Thin Shrink
Small-Outline (DGG), and Thin Very
Small-Outline (DGV) Packages
description
YERR
This 12-bit universal bus driver is designed for
2.3-V to 3.6-V V operation.
V
V
CC
CC
CC
9Y1
9Y2
GND
10Y1
10Y2
9A
MODE
GND
10A
PARI/O
CLKEN
The SN74ALVCH16903 has dual outputs and can
operate as a buffer or an edge-triggered register.
In both modes, parity is checked on APAR, which
arrives one cycle after the data to which it applies.
The YERR output, which is produced one cycle
after APAR, is open drain.
PAROE
MODEselects one of the two data paths. When MODE is low, the device operates as an edge-triggered register.
On the positive transition of the clock (CLK) input and when the clock-enable (CLKEN) input is low, data set up
at the A inputs is stored in the internal registers. On the positive transition of CLK and when CLKEN is high, only
data set up at the 9A–12A inputs is stored in their internal registers. When MODE is high, the device operates
as a buffer and data at the A inputs passes directly to the outputs. 11A/YERREN serves a dual purpose; it acts
as a normal data bit and also enables YERR data to be clocked into the YERR output register.
When used as a single device, parity output enable (PAROE) must be tied high; when parity input/output
(PARI/O) is low, even parity is selected and when PARI/O is high, odd parity is selected. When used in pairs
and PAROE is low, the parity sum is output on PARI/O for cascading to the second SN74ALVCH16903. When
used in pairs and PAROE is high, PARI/O accepts a partial parity sum from the first SN74ALVCH16903.
A buffered output-enable (OE) input can be used to place the 24 outputs and YERR in either a normal logic state
(high or low logic levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor
drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive
bus lines without need for interface or pullup components.
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.
EPIC and Widebus are trademarks of Texas Instruments Incorporated.
Copyright 1998, 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
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