74LS173 4-bit D-type Register Tri-state
Package SOIC Series 74LS
74LS173 overview
The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. The 74LS173A 4-bit registers include D-type flip-flops featuring totem-pole 3-state Outputs capable of driving highly capacitive or relatively low-impedance loads.
Key specifications
Supply Voltage
4.75 - 5.25Vdc
Maximum Clock Frequency
40Mhz
Power Dissipation
2mW/gate @100kHz
Minimum Output Current
8mA
Propagation Delay
10nS
Fan Out (TTL Loads)
20
Datasheet
173.pdf
74LS173 features
- 3-State Outputs Interface Directly With System Bus
- Gated Output-Control LInes for Enabling or Disabling the Outputs
- Fully Independent Clock Virtually
74LS173 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | OE1 | Output Enable (Active LOW) Inputs |
| 2 | OE2 | Output Enable (Active LOW) Inputs |
| 3 | Q0 | Output |
| 4 | Q1 | Output |
| 5 | Q2 | Output |
| 6 | Q3 | Output |
| 7 | CP | Clock Pulse (Active HIGH Going Edge) Input |
| 8 | GND | Ground |
| 9 | IE1 | Input Enable (Active LOW) |
| 10 | IE2 | Input Enable (Active LOW) |
| 11 | D3 | Data Input |
| 12 | D2 | Data Input |
| 13 | D1 | Data Input |
| 14 | D0 | Data Input |
| 15 | MR | Master Reset |
| 16 | VCC | Positive Supply |
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