SN74LS191N ,PRESETTABLE BCD/DECADE UP/DOWN COUNTERS PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERSSN54/74LS190SN54/74LS191PRESETTABLE BCD/DECADEUP/DOWN COUNTERSPRESETTABLE 4-BIT BINARYPRESETTABLE B ..
SN74LS191NSR ,Synchronous 4-Bit Up/Down Counters With Up/Down Mode Control
SN74LS192 ,SYNCHRONOUS 4-BIT UP/DOWN COUNTERS (DUAL CLOCK WITH CLEAR)
SN74LS193D ,PRESETTABLE BCD/DECADE UP/DOWN COUNTER PRESETTABLE 4-BIT BINARY UP/DOWN COUNTER
SN74LS193J ,Synchronous 4-Bit Up/Down Binary Counters With Dual Clock and Clear
SN74LS193J ,Synchronous 4-Bit Up/Down Binary Counters With Dual Clock and Clear
SOD4002 ,Conductor Holdings Limited - PLASTIC SILICON RECTIFIER
SOD4004 ,Conductor Holdings Limited - PLASTIC SILICON RECTIFIER
SOD4004 ,Conductor Holdings Limited - PLASTIC SILICON RECTIFIER
SOD4007 ,Conductor Holdings Limited - PLASTIC SILICON RECTIFIER
SOE-232HST , With Button Tactile Switches
SOE-232HST , With Button Tactile Switches
SN54LS190J-SN54LS191J-SN74LS190N-SN74LS191N
Synchronous Up/Down Decade Counters(single clock line)
PRESETT ABLE BCD/DECADE
UP/DOWN COUNTERS
PRESETT ABLE 4-BIT BINARY
UP/DOWN COUNTERSThe SN54/74LS190 is a synchronous UP/DOWN BCD Decade (8421)
Counter and the SN54/74LS191 is a synchronous UP/DOWN Modulo-16
Binary Counter. State changes of the counters are synchronous with the
LOW-to-HIGH transition of the Clock Pulse input.
An asynchronous Parallel Load (PL) input overrides counting and loads the
data present on the Pn inputs into the flip-flops, which makes it possible to use
the circuits as programmable counters. A Count Enable (CE) input serves as
the carry/borrow input in multi-stage counters. An Up/Down Count Control
(U/D) input determines whether a circuit counts up or down. A Terminal Count
(TC) output and a Ripple Clock (RC) output provide overflow/underflow
indication and make possible a variety of methods for generating
carry/borrow signals in multistage counter applications. Low Power ... 90 mW Typical Dissipation High Speed... 25 MHz Typical Count Frequency Synchronous Counting Asynchronous Parallel Load Individual Preset Inputs Count Enable and Up/Down Control Inputs Cascadable Input Clamp Diodes Limit High Speed Termination Effects
PIN NAMES LOADING (Note a)U/D
Count Enable (Active LOW) Input
Clock Pulse (Active HIGH going edge) Input
Up/Down Count Control Input
Parallel Load Control (Active LOW) Input
Parallel Data Inputs
Flip-Flop Outputs (Note b)
Ripple Clock Output (Note b)
Terminal Count Output (Note b)
NOTES:
