CY74FCT646T

CY54FCT646T, CY74FCT646T 8-BIT REGISTERED TRANSCEIVERS WITH 3-STATE OUTPUTS SCCS031A – JULY 1994 – REVISED OCTOBER 2001 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 Matched Rise and Fall Times D Fully Compatible With TTL Input and Output Logic Levels D ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) CY54FCT646T . . . D PACKAGE CY74FCT646T . . . Q OR SO PACKAGE (TOP VIEW) CPAB SAB DIR A1 A2 A3 A4 A5 A6 A7 A8 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 VCC 23 CPBA 22 SBA 21 G 20 B1 19 B2 18 B3 17 B4 16 B5 15 B6 14 B7 13 B8 – 1000-V Charged-Device Model (C101) D Independent Register for A and B Buses D CY54FCT646T CY54FCT646T . . . L PACKAGE (TOP VIEW) DIR SAB CPAB NC VCC CPBA SBA – 48-mA Output Sink Current – 12-mA Output Source Current D CY74FCT646T – 64-mA Output Sink Current – 32-mA Output Source Current D 3-State Outputs 4 3 2 1 28 27 26 A1 5 25 G A2 6 24 B1 A3 7 23 B2 NC 8 22 NC description The ’FCT646T devices consist of a bus transceiver circuit with 3-state, D-type flip-flops, A4 9 21 B3 A5 10 20 B4 A6 11 19 B5 12 13 14 15 16 17 18 A7 A8 GND NC B8 B7 B6 and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data o...