CY74FCT191T Series

Presettable Synchronous 4-Bit Up/Down Binary Counters

Catalog

Presettable Synchronous 4-Bit Up/Down Binary Counters

Part	Direction	Operating Temperature [Max]	Operating Temperature [Min]	Logic Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Timing	Package / Case	Package / Case	Package / Case	Number of Bits per Element	Supplier Device Package	Number of Elements	Trigger Type	Mounting Type	Package / Case [x]	Package / Case [y]
Texas Instruments CY74FCT191CTQCT	Down Up	85 °C	-40 °C	Binary Counter	4.75 V	5.25 V	Synchronous	0.154 in	16-SSOP	3.9 mm	4	16-SSOP	1	Positive Edge	Surface Mount
Texas Instruments CY74FCT191ATSOCT	Down Up	85 °C	-40 °C	Binary Counter	4.75 V	5.25 V	Synchronous		16-SOIC		4	16-SOIC	1	Positive Edge	Surface Mount	0.295 in	7.5 mm
Texas Instruments CY74FCT191CTSOC	Down Up	85 °C	-40 °C	Binary Counter	4.75 V	5.25 V	Synchronous		16-SOIC		4	16-SOIC	1	Positive Edge	Surface Mount	0.295 in	7.5 mm
Texas Instruments CY74FCT191ATSOC	Down Up	85 °C	-40 °C	Binary Counter	4.75 V	5.25 V	Synchronous		16-SOIC		4	16-SOIC	1	Positive Edge	Surface Mount	0.295 in	7.5 mm
Texas Instruments CY74FCT191CTSOCT	Down Up	85 °C	-40 °C	Binary Counter	4.75 V	5.25 V	Synchronous		16-SOIC		4	16-SOIC	1	Positive Edge	Surface Mount	0.295 in	7.5 mm

Catalog

Presettable Synchronous 4-Bit Up/Down Binary Counters

Key Features

• Function, Pinout, and Drive Compatible With FCT and F LogicReduced VOH(Typically = 3.3 V) Versions of Equivalent FCT FunctionsEdge-Rate Control Circuitry for Significantly Improved Noise CharacteristicsIoffSupports Partial-Power-Down Mode OperationESD Protection Exceeds JESD 222000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)Matched Rise and Fall Times64-mA Output Sink Current32-mA Output Source CurrentFunction, Pinout, and Drive Compatible With FCT and F LogicReduced VOH(Typically = 3.3 V) Versions of Equivalent FCT FunctionsEdge-Rate Control Circuitry for Significantly Improved Noise CharacteristicsIoffSupports Partial-Power-Down Mode OperationESD Protection Exceeds JESD 222000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)Matched Rise and Fall Times64-mA Output Sink Current32-mA Output Source Current

Description

The CY74FCT191T is a reversible modulo-16 binary counter, featuring synchronous counting and asynchronous presetting. The preset allows the CY74FCT191T to be used in programmable dividers. The count enable input, terminal count output, and ripple-clock output make possible a variety of methods of implementing multiusage counters. In the counting modes, state changes are initiated by the rising edge of the clock. This device is fully specified for partial-power-down applications using Ioff. The Ioffcircuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The CY74FCT191T is a reversible modulo-16 binary counter, featuring synchronous counting and asynchronous presetting. The preset allows the CY74FCT191T to be used in programmable dividers. The count enable input, terminal count output, and ripple-clock output make possible a variety of methods of implementing multiusage counters. In the counting modes, state changes are initiated by the rising edge of the clock. This device is fully specified for partial-power-down applications using Ioff. The Ioffcircuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.