SN74ALVCH16524
18-BIT REGISTERED BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCES080C – JULY 1996 – REVISED FEBRUARY 1999
DGG OR DL PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus Family
EPIC (Enhanced-Performance Implanted
CMOS) Submicron Process
GND
OEAB
A1
GND
A2
GND
SEL
B1
GND
B2
1
2
3
4
5
6
7
8
9
56
55
54
53
52
51
50
49
48
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
A3
B3
V
V
CC
CC
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
A4
A5
B4
B5
A6 10
47 B6
GND
A7
GND
B7
11
12
46
45
Package Options Include Plastic 300-mil
Shrink Small-Outline (DL) and Thin Shrink
Small-Outline (DGG) Packages
A8 13
A9 14
44 B8
43 B9
description
A10 15
A11 16
A12 17
GND 18
A13 19
A14 20
A15 21
B10
42
41 B11
40 B12
39 GND
38 B13
37 B14
36 B15
This 18-bit universal bus transceiver is designed
for 1.65-V to 3.6-V V operation.
CC
Data flow in each direction is controlled by
output-enable (OEAB and OEBA) and
clock-enable (CLKENBA) inputs. For the A-to-B
data flow, the data flows through a single buffer.
The B-to-A data can flow through a four-stage
pipeline register path, or through a single register
path, depending on the state of the select (SEL)
input.
V
22
35
V
CC
CC
A16 23
A17 24
34 B16
33 B17
32 GND
31 B18
30 CLK
29 GND
GND 25
A18 26
OEBA 27
CLKENBA 28
Data is stored in the internal registers on the
low-to-high transition of the clock (CLK) input,
provided that the appropriate CLKENBA input is
low. The B-to-A data transfer is synchronized with
CLK.
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 SN74ALVCH16524 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.
EPIC and Widebus 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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265