SC28C94 datasheet(30/38 Pages) PHILIPS

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Philips Semiconductors

Product specification

SC28C94

Quad universal asynchronous receiver/transmitter (QUART)

1998 Aug 19

C1 and C2 should be chosen according to the

crystal manufacturer’s specification.

C1 and C2 values will include any parasitic

capacitance of the wiring.

X1/CLK

CTCLK

RxC

TxC

tCLK

tCTC

tRx

tTx

tCLK

tCTC

tRx

tTx

+5V

1K required for

TTL gate.

C1 = C2 = 24pF FOR CL = 20PF

3.6864MHz

3pF

4pF

50 KOHMs

150 KOHMs

26C94

NOTES:

C1 and C2 should be based on manufacturer’s specification.

X1 and X2 parasitic capacitance IS 1-2pF AND 3-5pF, respectively.

GAIN:

at 4MHz 8 to 14db; at 8MHz 2 to 6db

PHASE: at 4MHz 272

° to 276°; at 8MHz 272° to 276°

TYPICAL CRYSTAL SPECIFICATION

FREQUENCY:

2 – 4MHZ

LOAD CAPACITANCE (CL):

12 – 32pF

TYPE OF OPERATION:

PARALLEL RESONANT, FUNDAMENTAL MODE

MUX

remainder

of circuit

÷ 2

38.4kHz CLOCK

BRG

TO I/O CHANGE-OF-STATE DETECTORS

STANDARD

BAUD

RATES

SD00172

POWER DOWN

Figure 14. Clock Timing

TxC

(INPUT)

TxD

TxC

(1X OUTPUT)

1 BIT TIME

(1 OR 16 CLOCKS

tTCS

tTXD

SD00173

Figure 15. Transmit Clock Timing

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