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SN54LSXXXJ 数据手册 ( 数据表 )

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SN54LSXXXJ
Motorola
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The SN54/74LS390 and SN54/74LS393 each contain a pair of high-speed 4-stage ripple counters. Each half of the LS390 is partitioned into a divide-by-two section and a divide-by five section, with a separate clock input for each section. The two sections can be connected to count in the 8.4.2.1 BCD code or they can count in a biquinary sequence to provide a square wave (50% duty cycle) at the final output.
Each half of the LS393 operates as a Modulo-16 binary divider, with the last three stages triggered in a ripple fashion. In both the LS390 and the LS393, the flip-flops are triggered by a HIGH-to-LOW transition of their CP inputs.
Each half of each circuit type has a Master Reset input which responds to a HIGH signal by forcing all four outputs to the LOW state.

• Dual Versions of LS290 and LS293
• LS390 has Separate Clocks Allowing ÷2, ÷2.5, ÷5
• Individual Asynchronous Clear for Each Counter
• Typical Max Count Frequency of 50 MHz
• Input Clamp Diodes Minimize High Speed Termination Effects

 

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零件编号
产品描述 (功能)
PDF
生产厂家
DUAL DECADE COUNTER; DUAL 4-STAGE BINARY COUNTER
ON Semiconductor
HC4520 DUAL 4 BIT BINARY COUNTER HC4518 DUAL DECADE COUNTER
STMicroelectronics
DUAL DECADE COUNTER; DUAL 4-STAGE BINARY COUNTER
ON Semiconductor
HC4520 DUAL 4 BIT BINARY COUNTER HC4518 DUAL DECADE COUNTER
STMicroelectronics
Synchronous Decade Counter (Direct Clear)/Synchronous 4-bit Binary Counter (Direct Clear)/Synchronous Decade Counter (Synchronous Clear)/Synchronous 4-bit Binary Counter (Synchronous Clear)
Renesas Electronics
DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER
ON Semiconductor
14-Stage Binary Counter • 12-Stage Binary Counter
Fairchild Semiconductor
14-Stage Binary Counter • 12-Stage Binary Counter
Fairchild Semiconductor
14-Stage Binary Counter • 12-Stage Binary Counter
Fairchild Semiconductor
Synchronous Decade Counter (Direct Clear)/Synchronous 4-bit Binary Counter (Direct Clear)/Synchronous Decade Counter (Synchronous Clear)/Synchronous 4-bit Binary Counter (Synchronous Clear)
Hitachi -> Renesas Electronics

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