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CY74FCT825T Datasheet(PDF) 2 Page - Texas Instruments |
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CY74FCT825T Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page CY74FCT825T 8-BIT BUS-INTERFACE REGISTER WITH 3-STATE OUTPUTS SCCS070A – OCTOBER 2001 – REVISED NOVEMBER 2001 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PIN DESCRIPTION NAME I/O DESCRIPTION D I D flip-flop data inputs CLR I When CLR is low and OE is low, Q outputs are low. When CLR is high, data can be entered into the register. CP O Clock pulse for the register. Enters data into the register on the low-to-high clock transition. Y O Register 3-state outputs EN I Clock enable. When EN is low, data on the D input is transferred to the Q output on the low-to-high clock transition. When EN is high, the Q outputs do not change state, regardless of the data or clock input transitions. OE I Output control. When OE is high, the Y outputs are in the high-impedance state. When OE is low, true register data is present at the Y outputs. FUNCTION TABLE INPUTS INTERNAL OUTPUTS FUNCTION OE CLR EN D CP Q Y H H L L ↑ L Z Z H HL H ↑ H Z Z H L X X X L Z Clear L LX X XL L Clear H H H X X NC Z Hold L HH X XNC NC Hold H H L L ↑ L Z H HL H ↑ H Z Load L HL L ↑ L L Load L H L H ↑ H H H = High logic level, L = Low logic level, X = Don’t care, NC = No change, ↑ = Low-to-high transition, Z = High-impedance state logic diagram (positive logic) Q To Seven Other Channels Y0 EN OE2 CLR 11 13 14 3 CL D CP 22 OE1 OE3 23 2 1 CP D0 |
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