SN64BCT657 OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER AND 3-STATE OUTPUTS

SCBS090A - NOVEMBER 1991 - REVISED JANUARY 1994

features

State-of-the-Art BiCMOS Design Significantly Reduces I_CCZ
ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
High-Impedance State During Power Up and Power Down
3-State B Outputs Sink 64 mA and Source 15 mA
Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic 300-mil DIPs (NT)

description

The SN64BCT657 contains eight noninverting buffers with paritygenerator/checker circuits and control signals. The transmit/receive(T/R\) input determines the direction of data flow. When T/R\ ishigh, data flows from the A port to the B port (transmit mode); whenT/R\ is low, data flows from the B port to the A port (receive mode).When the output-enable ()input is high, both the A and B ports are in the high-impedancestate.

Odd or even parity is selected by a logic high or low level on theODDinput. PARITYcarries the parity bit value; it is an output from the paritygenerator/checker in the transmit mode and an input to the paritygenerator/checker in the receive mode.

In the transmit mode, after the A bus is polled to determine thenumber of high bits, PARITY is set to the logic level that maintainsthe parity sense selected by the level at the ODD input. For example, if ODD is low (even parity selected) andthere are five high bits on the A bus, then PARITY is set to thelogic high level so that an even number of the nine total bits (eightA-bus bits plus parity bit) are high.

In the receive mode, after the B bus is polled to determine thenumber of high bits, the error () output logic level indicates whether or not the datato be received exhibits the correct parity sense. For example, ifODD is high (oddparity selected), PARITY is high, and there are three high bits onthe B bus, then is low,indicating a parity error.

The SN64BCT657 is characterized for operation from -40°C to85°C and 0°C to 70°C.

Title: OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER AND 3-STATE OUTPUTS
Product Family: PARITY TRANSCEIVERS
Device Functionality: OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER AND 3-STATE OUTPUTS
Orderable Devices: SN64BCT657DW, SN64BCT657NT

View the complete PDF datasheet: scbs090a.pdf (107 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN64BCT657

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