SN54/74LS170 4 x 4 REGISTER FILE OPEN-COLLECTOR
The TTL / MSI SN54 / 74LS170 is a high-speed, low-power 4 x 4 Register F...
SN54/74LS170 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.
4 x 4 REGISTER FILE OPEN-COLLECTOR
LOW POWER
SCHOTTKY
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
J SUFFIX CERAMIC CASE 620-09
16 1
CONNECTION DIAGRAM 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 pinouts (Connection Diagram) as the Dual In-Line Package. 16 1
N SUFFIX PLASTIC CASE 648-08
16 1
D SUFFIX SOIC CASE 751B-03
1 D2
2 D3
3 D4
4 RB
5 RA
6 Q4
7 Q3
8 GND
ORDERING INFORMATION
SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC
PIN NAMES
LOADING (Note a) HIGH LOW 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.
LOGIC SYMBOL
12 14 13 5 4 WA EW WB RA RB ER 11 15 1 2 3 D1 D2 D3 D4 Q1 Q2 Q3 Q4 10 9 7 6
D1 – D4 WA, WB EW RA, RB ER Q1 – Q4
Data Inputs Write Address...