CY74FCT646T

Features:

• Function, pinout, and drive compatible with FCT and
   F logic
• FCT-C speed at 5.4 ns max. (Com'l)
   FCT-A speed at 6.3 ns max. (Com'l)
• Reduced VOH (typically = 3.3V) versions of equivalent
   FCT functions
• Edge-rate control circuitry for significantly improved
   noise characteristics
• Power-off disable feature permits live insertion
• Matched rise and fall times
• Fully compatible with TTL input and output logic levels
• ESD > 2000V
• Sink current 64 mA (Com'l), 48 mA (Mil)
   Source current 32 mA (Com'l), 12 mA (Mil)
• Independent register for A and B buses
• Extended commercial range of −40˚C to +85˚C


Pinout






Specifications

(Above which the useful life may be impaired. For user
guidelines, not tested.)

Storage Temperature ................................65°C to +150°C
Ambient Temperature with
Power Applied............................................65°C to +135°C
Supply Voltage to Ground Potential ...............  0.5V to +7.0V
DC Input Voltage............................................  0.5V to +7.0V
DC Output Voltage ......................................... 0.5V to +7.0V
DC Output Current (Maximum Sink Current/Pin) .......   120 mA
Power Dissipation .......................................................... 0.5W
Static Discharge Voltage............................................  >2001V
(per MIL-STD-883, Method 3015)


Description

The FCT646T consists of a bus transceiver circuit with three-state, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes to a HIGH logic level. Enable Control G and direction pins of FCT646T are provided to control the transceiver function. In the transceiver mode, data present at the high-impedance port may be stored in either the A or B register, or in both. The select controls can multiplex stored and real-time (transparent mode) data. The direction control of FCT646T determines which bus will receive data when the enable control G is Active LOW. In the isolation mode (enable Control G HIGH), A data may be stored in the B register and/or B data may be stored in the A register.

The outputs of the FCT646T are designed with a power-off disable feature to allow for live insertion of boards.