SN54LS170 OPEN-COLLECTOR Datasheet

SN54LS170 Datasheet, PDF, Equivalent


Part Number

SN54LS170

Description

4 x 4 REGISTER FILE OPEN-COLLECTOR

Manufacture

Motorola Inc

Total Page 4 Pages
Datasheet
Download SN54LS170 Datasheet


SN54LS170
4 x 4 REGISTER FILE
OPEN-COLLECTOR
The TTL / MSI SN54 / 74LS170 is a high-speed, low-power 4 x 4 Register
File organized as four words by four bits. Separate read and write inputs, both
address and enable, allow simultaneous read and write operation.
Open-collector outputs make it possible to connect up to 128 outputs in a
wired-AND configuration to increase the word capacity up to 512 words. Any
number of these devices can be operated in parallel to generate an n-bit
length.
The SN54 / 74LS670 provides a similar function to this device but it features
3-state outputs.
Simultaneous Read/ Write Operation
Expandable to 512 Words of n-Bits
Typical Access Time of 20 ns
Low Leakage Open-Collector Outputs for Expansion
Typical Power Dissipation of 125 mW
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC D1 WA WB EW ER Q1 Q2
16 15 14 13 12 11 10 9
1 2 3 4 56 78
D2 D3 D4 RB RA Q4 Q3 GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
PIN NAMES
LOADING (Note a)
HIGH
LOW
D1 – D4
WA, WB
EW
RA, RB
ER
Q1 – Q4
Data Inputs
Write Address Inputs
Write Enable (Active LOW) Input
Read Address Inputs
Read Enable (Active LOW) Input
Outputs (Note b)
0.5 U.L.
0.5 U.L.
1.0 U.L.
0.5 U.L.
1.0 U.L.
Open-Collector
0.25 U.L.
0.25 U.L.
0.5 U.L.
0.25 U.L.
0.5 U.L.
5 (2.5) U.L.
NOTES:
a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
b. Temperature Ranges. The Output HIGH drive must be supplied by an external resistor to VCC.
SN54/74LS170
4 x 4 REGISTER FILE
OPEN-COLLECTOR
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
12 15 1 2 3
14
13
WA EW
WB
D1 D2 D3 D4
5 RA
4 RB ER Q1 Q2 Q3 Q4
11 10 9 7 6
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
5-1

SN54LS170
12
EW
13
WB
WA 14
SN54 / 74LS170
LOGIC DIAGRAM
D4 D3
32
D2 D1
1 15
GD
Q
GD
Q
GD
Q
WORD
0
GD
Q
GD
Q
GD
Q
GD
Q
WORD
G D1
Q
GD
Q
GD
Q
GD
Q
WORD
G D2
Q
4
RB
GD
Q
11
ER
5
RA
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
6
Q4
GD
Q
7
Q3
GD
Q
9
Q2
WORD
G D3
Q
10
Q1
FAST AND LS TTL DATA
5-2


Features SN54/74LS170 4 x 4 REGISTER FILE OPEN-CO LLECTOR The TTL / MSI SN54 / 74LS170 is a high-speed, low-power 4 x 4 Register File organized as four words by four b its. Separate read and write inputs, bo th address and enable, allow simultaneo us read and write operation. Open-colle ctor outputs make it possible to connec t up to 128 outputs in a wired-AND conf iguration to increase the word capacity up to 512 words. Any number of these d evices can be operated in parallel to g enerate an n-bit length. The SN54 / 74L S670 provides a similar function to thi s device but it features 3-state output s. 4 x 4 REGISTER FILE OPEN-COLLECTOR LOW POWER SCHOTTKY • • • • • Simultaneous Read/ Write Operation Ex pandable to 512 Words of n-Bits Typical Access Time of 20 ns Low Leakage Open- Collector Outputs for Expansion Typical Power Dissipation of 125 mW J SUFFIX CERAMIC CASE 620-09 16 1 CONNECTION DI AGRAM DIP (TOP VIEW) VCC 16 D1 15 WA 14 WB 13 EW 12 ER 11 Q1 10 Q2 9 NOTE: The Flatpak version has the same pino.
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