SN74LS170 OPEN-COLLECTOR Datasheet

SN74LS170 Datasheet, PDF, Equivalent


Part Number

SN74LS170

Description

4 x 4 REGISTER FILE OPEN-COLLECTOR

Manufacture

Motorola

Total Page 4 Pages
Datasheet
Download SN74LS170 Datasheet


SN74LS170
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

SN74LS170
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 4 x 4 REGISTER FILE OPEN-COLLECTOR The T TL / MSI SN54 / 74LS170 is a high-speed , low-power 4 x 4 Register File organiz ed as four words by four bits. Separate read and write inputs, both address an d enable, allow simultaneous read and w rite operation. Open-collector outputs make it possible to connect up to 128 o utputs in a wired-AND configuration to increase the word capacity up to 512 wo rds. 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. • Simult aneous Read/ Write Operation • Expand able to 512 Words of n-Bits • Typical Access Time of 20 ns • Low Leakage O pen-Collector Outputs for Expansion • Typical Power Dissipation of 125 mW C ONNECTION 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. .
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