SN74ALVCH162601
18-BIT UNIVERSAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCES026G – JULY 1995 – REVISED JUNE 1999
DGG OR DL PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus Family
EPIC (Enhanced-Performance Implanted
CMOS) Submicron Process
OEAB
LEAB
A1
GND
A2
1
56 CLKENAB
55 CLKAB
54 B1
2
UBT (Universal Bus Transceiver)
3
Combines D-Type Latches and D-Type
Flip-Flops for Operation in Transparent,
Latched, Clocked, or Clock-Enabled Mode
4
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
GND
B2
B3
5
6
A3
B-Port Outputs Have Equivalent 26-Ω
Series Resistors, So No External Resistors
Are Required
7
V
V
CC
A4
CC
8
B4
B5
B6
GND
B7
9
A5
A6
GND
A7
A8
A9
A10
A11
A12
GND
A13
A14
A15
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
B8
B9
Latch-Up Performance Exceeds 250 mA Per
JESD 17
B10
B11
B12
GND
B13
B14
B15
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
Package Options Include Plastic 300-mil
Shrink Small-Outline (DL) and Thin Shrink
Small-Outline (DGG) Packages
NOTE: For tape and reel order entry:
V
V
CC
CC
The DGGR package is abbreviated to GR.
A16
A17
GND
A18
OEBA
LEBA
B16
B17
GND
B18
CLKBA
CLKENBA
description
This 18-bit universal bus transceiver is designed
for 1.65-V to 3.6-V V
operation.
CC
The SN74ALVCH162601 combines D-type
latches and D-type flip-flops to allow data flow in
transparent, latched, clocked, and clock-enabled
modes.
Data flow in each direction is controlled by output-enable (OEAB and OEBA), latch-enable (LEAB and LEBA),
and clock (CLKAB and CLKBA) inputs. The clock can be controlled by the clock-enable (CLKENAB and
CLKENBA) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When
LEAB is low, the A data is latched if CLKAB is held at a high or low logic level. If LEAB is low, the A data is stored
in the latch/flip-flop on the low-to-high transition of CLKAB. When OEAB is low, the outputs are active. When
OEAB is high, the outputs are in the high-impedance state.
Data flow for B to A is similar to that of A to B, but uses OEBA, LEBA, CLKBA, and CLKENBA.
The B-port outputs include equivalent 26-Ω series resistors to reduce overshoot and undershoot.
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.
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265