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CY74FCT191ATSOC Datasheet(PDF) 1 Page - Texas Instruments |
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CY74FCT191ATSOC Datasheet(HTML) 1 Page - Texas Instruments |
1 / 14 page CY74FCT191T 4-BIT UP/DOWN BINARY COUNTER SCCS016A – MAY 1994 – REVISED SEPTEMBER 2001 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Function, Pinout, and Drive Compatible With FCT and F Logic D Reduced VOH (Typically = 3.3 V) Versions of Equivalent FCT Functions D Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics D Ioff Supports Partial-Power-Down Mode Operation D ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) D Matched Rise and Fall Times D 64-mA Output Sink Current 32-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 Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. PIN DESCRIPTION NAME DESCRIPTION CE Count enable input (active low) CP Clock pulse input (active rising edge) P Parallel data inputs PL Asynchronous parallel load input (active low) U/D Up/down count control input Q Flip-flop outputs RC Ripple clock output (active low) TC Terminal count output Copyright 2001, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 P1 Q1 Q0 CE U/D Q2 Q3 GND VCC P0 CP RC TC PL P2 P3 Q OR SO PACKAGE (TOP VIEW) |
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