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Fairchild
Fairchild Semiconductor
Description : Up/Down Decade Counter with Preset and Ripple Clock

General Description
The 74F190 is a reversible BCD (8421) decade Counter featuring synchronous counting and asynchronous Preset ting. The Preset feature allows the 74F190 to be used in programmable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage Counters. In the counting modes, state changes are  initiated by the rising edge of the Clock.

Features
■ High-speed—125 MHz typical count frequency
■ Synchronous counting
■ Asynchronous parallel load
■ Cascadable

 

Description : Up/Down Counter with Preset and Ripple Clock

General Description
The AC191 is a reversible modulo 16 binary Counter. It features synchronous counting and asynchronous Presetting. The Preset feature allows the AC191 to be used in programmable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage Counters. In the counting modes, state changes are initiated by the rising edge of the Clock.

Features
■ ICC reduced by 50%
■ High speed—133 MHz typical count frequency
■ Synchronous counting
■ Asynchronous parallel load
■ Cascadable
■ Outputs source/sink 24 mA

Description : Up/Down Binary Counter with Preset and Ripple Clock

General Description
The 74F191 is a reversible modulo-16 binary Counter featuring synchronous counting and asynchronous Presetting. The Preset feature allows the 74F191 to be used in programmable dividers. The Count Enable input, the Terminal Count output and Ripple Clock output make possible a variety of methods of implementing multistage Counters. In the counting modes, state changes are initiated by the rising edge of the Clock.

Features
■ High-Speed—125MHz typical count frequency
■ Synchronous counting
■ Asynchronous parallel load
■ Cascadable

Part Name(s) : HD14024 HD14024B
Hitachi
Hitachi -> Renesas Electronics
Description : Seven Stage Ripple Counter

Seven Stage Ripple Counter

The HD14024B is a seven stage Ripple Counter with short propagation delays and high maximum Clock rates.

Renesas
Renesas Electronics
Description : Synchronous Up / Down 4-bit Binary Counter (single Clock line)

Synchronous Up / Down 4-bit Binary Counter (single Clock line)

Synchronous operation is provided by having all flip-flops Clocked simultaneously so that the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (Ripple Clock) Counters. The outputs of the four master-slave flip-flops are triggered on a low-to-high-level transition of the Clock input if the enable input is high. The direction of the count is determined by the level of the down / up input. When low, the Counter counts up and when high, it counts down. Level changes at the down / up input should be made only when the Clock input is high. This Counter is fully programmable; that is, the outputs may be Preset to either level by placing a low on the load input and entering the desired data at the data inputs. The output will change to agree with the data inputs independently of the level of the Clock input. This feature allows the Counters to be used as modulo-N dividers by simply modifying the count length with the Preset inputs. The Clock, down / up, and load inputs are buffered to lower the drive requirement which significantly reduces the number of Clock drivers, etc., required for long parallel words.

Part Name(s) : HD151011
Hitachi
Hitachi -> Renesas Electronics
Description : Dual BCD Programmable Counter with Synchronous Preset Enable

The HD151011 has BCD decimal two digits down Counter and D-type Flip Flop. The Counter can set up to max 99 counts and synchronous Preset (SPE) input can Preset the data. When the count value is 0, the next Clock pulse Presets the data to invert the output. D-type Flip Flop takes the Counter output as Clock pulse, whose data is transferred to output at the rise edge. It is applied to generate AC signal for STN type liquid crystal and general-use divider.

Features
• High speed operation
    tpd (CLK or CLK to Q) = 35 ns (typ)
• High output current
    Fanout of 10 LS TTL Loads
• Wide operating voltage
    Vcc = 2 to 6 V
• Low supply current (Ta = 25°C)
    Icc (Static) = 4 µA (max)

Part Name(s) : HD151012
Hitachi
Hitachi -> Renesas Electronics
Description : 8-bit Binary Programmable Counter with Synchronous Preset Enable

Description
The HD151012 has 8-bit binary down Counter and D-type Flip Flop. The Counter can set up to max 256 counts and synchronous Preset (SPE) input can Preset the data. When the count value is 0, the next Clock pulse Presets the data to invert the output. D-type Flip Flop takes the Counter output as Clock pulse, whose data is transferred to output at the rise edge. It is applied to generate AC signal for STN type liquid crystal and general-use divider.

Features
• High speed operation
    tpd (CLK or CLK to Q) = 35 ns (typ)
• High output current
    Fanout of 10 LS TTL Loads
• Wide operating voltage
    VCC = 2 to 6 V
• Low supply current (Ta = 25°C)
    ICC (Static) = 4 µA (max)

Renesas
Renesas Electronics
Description : Dual BCD Programmable Counter with Synchronous Preset Enable

Description
The HD151011 has BCD decimal two digits down Counter and D-type Flip Flop. The Counter can set up to max 99 counts and synchronous Preset (SPE) input can Preset the data. When the count value is 0, the next Clock pulse Presets the data to invert the output. D-type Flip Flop takes the Counter output as Clock pulse, whose data is transferred to output at the rise edge. It is applied to generate AC signal for STN type liquid crystal and general-use divider.

Features
• High speed operation
    tpd (CLK or CLK to Q) = 35 ns (typ)
• High output current
    Fanout of 10 LS TTL Loads
• Wide operating voltage
    VCC = 2 to 6 V
• Low supply current (Ta = 25°C)
    ICC (Static) = 4 µA (max)

Part Name(s) : HD151012 HD151012TELL
Renesas
Renesas Electronics
Description : 8-bit Binary Programmable Counter with Synchronous Preset Enable

Description
The HD151012 has 8-bit binary down Counter and D-type Flip Flop. The Counter can set up to max 256 counts and synchronous Preset (SPE) input can Preset the data. When the count value is 0, the next Clock pulse Presets the data to invert the output. D-type Flip Flop takes the Counter output as Clock pulse, whose data is transferred to output at the rise edge. It is applied to generate AC signal for STN type liquid crystal and general-use divider.

Features
• High speed operation
    tpd (CLK or CLK to Q) = 35 ns (typ)
• High output current
    Fanout of 10 LS TTL Loads
• Wide operating voltage
    VCC = 2 to 6 V
• Low supply current (Ta = 25°C)
    ICC (Static) = 4 µA (max)

Motorola
Motorola => Freescale
Description : 14-Stage Binary Ripple Counter

14-Stage Binary Ripple Counter

The MC74AC4020 consists of 14 master-slave flip-flops with 12 stages brought out to pins. The output of each flip-flop feeds the next and the frequency at each output is half that of the preceding one. The state of the Counter advances on the negative-going edge of the Clock input. Reset is asynchronous and active-high. State changes of the Q outputs do not occur simultaneously because of internal Ripple delays. Therefore, decoded output signals are subject to decoding spikes and may have to be gated with the Clock of the MC74AC4020 for some designs.

• 140 MHz Typ. Clock
• Outputs Source/Sink 24 mA
• Operating Voltage Range: 2.0 to 6.0 V
• High Noise Immunity

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