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SN54-74LS90 датащи(PDF) 1 Page - ON Semiconductor |
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SN54-74LS90 датащи(HTML) 1 Page - ON Semiconductor |
1 / 6 page 5-1 FAST AND LS TTL DATA DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER The SN54 / 74LS90, SN54 / 74LS92 and SN54 / 74LS93 are high-speed 4-bit ripple type counters partitioned into two sections. Each counter has a di- vide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or divide-by-eight (LS93) section which are triggered by a HIGH-to-LOW transi- tion on the clock inputs. Each section can be used separately or tied together (Q to CP) to form BCD, bi-quinary, modulo-12, or modulo-16 counters. All of the counters have a 2-input gated Master Reset (Clear), and the LS90 also has a 2-input gated Master Set (Preset 9). • Low Power Consumption ...Typically 45 mW • High Count Rates ...Typically 42 MHz • Choice of Counting Modes . . . BCD, Bi-Quinary, Divide-by-Twelve, Binary • Input Clamp Diodes Limit High Speed Termination Effects PIN NAMES LOADING (Note a) HIGH LOW CP0 Clock (Active LOW going edge) Input to ÷2 Section 0.5 U.L. 1.5 U.L. CP1 Clock (Active LOW going edge) Input to ÷5 Section (LS90), ÷6 Section (LS92) 0.5 U.L. 2.0 U.L. CP1 Clock (Active LOW going edge) Input to ÷8 Section (LS93) 0.5 U.L. 1.0 U.L. MR1, MR2 Master Reset (Clear) Inputs 0.5 U.L. 0.25 U.L. MS1, MS2 Master Set (Preset-9, LS90) Inputs 0.5 U.L. 0.25 U.L. Q0 Output from ÷2 Section (Notes b & c) 10 U.L. 5 (2.5) U.L. Q1, Q2, Q3 Outputs from ÷5 (LS90), ÷6 (LS92), ÷8 (LS93) Sections (Note b) 10 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. c. The Q0 Outputs are guaranteed to drive the full fan-out plus the CP1 input of the device. d. To insure proper operation the rise (tr) and fall time (tf) of the clock must be less than 100 ns. SN54/74LS90 SN54/74LS92 SN54/74LS93 DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 632-08 N SUFFIX PLASTIC CASE 646-06 14 1 14 1 ORDERING INFORMATION SN54LSXXJ Ceramic SN74LSXXN Plastic SN74LSXXD SOIC 14 1 D SUFFIX SOIC CASE 751A-02 LOGIC SYMBOL 12 2 VCC = PIN 5 GND = PIN 10 NC = PINS 4, 13 VCC = PIN 5 GND = PIN 10 NC = PINS 2, 3, 4, 13 VCC = PIN 5 GND = PIN 10 NC = PIN 4, 6, 7, 13 LS90 LS92 LS93 67 12 14 1 12 23 MS CP0 CP1 MR Q0 Q1 Q2 Q3 12 9 8 11 6 7 14 1 1 CP0 CP1 MR Q0 Q1 Q2 Q3 12 9 8 11 14 1 23 CP0 CP1 MR Q0 Q1 Q2 Q3 12 9 8 11 |
Аналогичный номер детали - SN54-74LS90 |
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Аналогичное описание - SN54-74LS90 |
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