74ACT899

Features:

`Latchable transceiver with output sink of 24 mA
`Option to select generate parity and check or"feed-through" data/parity in directions A-to-B or B-to-A
`Independent latch enable for A-to-B and B-to-A directions
`Select pin for ODD/EVEN parity
`ERRA and ERRB output pins for parity checking
`Ability to simultaneously generate and check parity
`May be used in system applications in place of the 280
`May be used in system applications in place of the 657 and 373 (no need to change T/R to check parity)


Pinout




Specifications

Supply Voltage (VCC) . . . . .. . -0.5V to +7.0V
DC Input Diode Current (IIK)
  VI = -0.5V . . . . .. . . . .. . . . .. -20 mA
  VI = VCC + 0.5V . . . . .. . . . .. . . +20 mA
DC Input Voltage (VI) . . . .-0.5V to VCC + 0.5V
DC Output Diode Current (IOK)
  VO = -0.5V . . . . .. . . . .. . . . .. -20 mA
  VO = VCC + 0.5V . . . . .. . . . .. . . +20 mA
DC Output Voltage (VO) . . . -0.5V to VCC + 0.5V
DC Output Source
  or Sink Current (IO). . . . .. . . . . ±50 mA
DC VCC or Ground Current
  per Output Pin (ICC or IGND) . . . . . ±50 mA
Storage Temperature (TSTG). .  -65°C to +150°C
DC Latch-Up Source or
  Sink Current . . . . .. . . . . . . . ±300 mA
Junction Temperature (TJ)  . . . .. . .  .140°C


Description

The 74ACT899 is a 9-bit to 9-bit parity transceiver with transparent latches. The device can operate as a feed-through transceiver or it can generate/check parity from the 8-bit data busses in either direction. The 74ACT899 features independent latch enables for the A-to-B direction and the B-to- A direction, a select pin for ODD/EVEN parity, and separate error signal output pins for checking parity.