The LS90, LS92, and LS93 are 4-bit ripple type Decade, Divide-By-Twelve, and Binary Counters respectively. Each device consists of four master/slave flip-flops which are internally connected to provide a divide-by-two section and a divide-by-five (LS90), divide-by-six (LS92), or divide-by-eight (LS93) section. Each section has a separate clock input which in.
ctive LOW going edge) Input to ÷5 Section (LS90), ÷6 Section (LS92) Clock (Active LOW going edge) Input to ÷8 Section (LS93) Master Reset (Clear) Inputs Master Set (Preset-9, LS90) Inputs Output from ÷2 Section (Notes b & c) Outputs from ÷5 (LS90), ÷6 (LS92), ÷8 (LS93) Sections (Note b) 0.5 U.L. 1.5 U.L. 0.5 U.L. 2.0 U.L. 0.5 U.L. 1.0 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 10 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) b. Temperature Ran.
The LS90, LS92, and LS93 are 4-bit ripple type Decade, Divide-By-Twelve, and Binary Counters respectively. Each device c.
SN5490A, SN5492A, SN5493A, SN54LS90, SN54LS92, SN54LS93 SN7490A, SN7492A, SN7493A, SN74LS90, SN74LS92, SN74LS93 DECADE, .
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | SN74LS90 |
ON Semiconductor |
DECADE COUNTER | |
2 | SN74LS90 |
Motorola |
4-BIT BINARY COUNTER | |
3 | SN74LS90 |
Texas Instruments |
DIVIDE-BY-TWELVE AND BINARY COUNTERS | |
4 | SN74LS91 |
Texas Instruments |
8-BIT SHIFT REGISTER | |
5 | SN74LS93 |
ON Semiconductor |
4-BIT BINARY COUNTER | |
6 | SN74LS93 |
Motorola |
4-BIT BINARY COUNTER | |
7 | SN74LS93 |
Texas Instruments |
DIVIDE-BY-TWELVE AND BINARY COUNTERS | |
8 | SN74LS95B |
Motorola |
4-BIT SHIFT REGISTER | |
9 | SN74LS00 |
Texas Instruments |
Quadruple 2-Input Positive-NAND Gates | |
10 | SN74LS00 |
Motorola |
QUAD 2-INPUT NAND GATE | |
11 | SN74LS00 |
ON Semiconductor |
Quad 2-Input NAND Gate | |
12 | SN74LS00N |
Texas Instruments |
Quadruple 2-Input Positive-NAND Gates |