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SN54LS399

Motorola
Part Number SN54LS399
Manufacturer Motorola
Description QUAD 2-PORT REGISTER
Published Apr 11, 2016
Detailed Description QUAD 2-PORT REGISTER The SN54 / 74LS398 and SN54 / 74LS399 are Quad 2-Port Registers. They are the logical equivalent of...
Datasheet PDF File SN54LS399 PDF File

SN54LS399
SN54LS399

Overview
QUAD 2-PORT REGISTER The SN54 / 74LS398 and SN54 / 74LS399 are Quad 2-Port Registers.
They are the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit edge-triggered register.
A Common Select input selects between two 4-bit input ports (data sources).
The selected data is transferred to the output register on the LOW-to-HIGH transition of the Clock input.
The SN54/ 74LS398 features both Q and Q inputs, while the SN54/ 74LS399 has only Q outputs.
• Select From Two Data Sources • Fully Positive Edge-Triggered Operation • Both True and Complemented Outputs on SN54/ 74LS398 • Input Clamp Diodes Limit High-Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC Qd Qd Iod I1d I1c I0c Qc Qc CP 20 19 18 17 16 15 14 13 12 11 SN54 / 74LS398 1 2 3 4 5 6 7 8 9 10 S Qa Qa I0a I1a I1b I0b Qb Qb GND VCC = PIN 20 GND = PIN 10 VCC Qd I0d I1d I1c I0c Qc CP 16 15 14 13 12 11 10 9 SN54 / 74LS399 1 2 3 4 56 78 S Qa I0a I1a I1b I0b Qb GND VCC = PIN 16 GND = PIN 8 PIN NAMES LOADING (Note a) HIGH LOW S CP I0a – I0d I1a – I0d Qa – Qd Qa – Qd Common Select Input Clock (Active HIGH Going Edge) Input Data Inputs From Source 0 Data Inputs From Source 1 Register True Outputs (Note b) Register Complementary Outputs (Note b) 0.
5 U.
L.
0.
5 U.
L.
0.
5 U.
L.
0.
5 U.
L.
10 U.
L.
10 U.
L.
0.
25 U.
L.
0.
25 U.
L.
0.
25 U.
L.
0.
25 U.
L.
5 (2.
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) Temperature Ranges.
SN54/74LS398 SN54/74LS399 QUAD 2-PORT REGISTER LOW POWER SCHOTTKY 16 1 16 1 16 1 J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 D SUFFIX SOIC CASE 751B-03 20 1 20 1 J SUFFIX CERAMIC CASE 732-03 N SUFFIX PLASTIC CASE 738-03 20 1 DW SUFFIX SOIC CASE 751D-03 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC SN74LSXXXD SOIC FAST AND LS TTL DATA 5-557 SN54/74LS398 • SN54/74LS399 FUNCTIONAL BLOCK DIAGRAM IOA ...


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