SC28C94 Philips Semiconductors, SC28C94 Datasheet - Page 30

• Manufacturer Part Number: SC28C94
• Description: Quad universal asynchronous receiver/transmitter QUART
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1998 Aug 19
Quad universal asynchronous receiver/transmitter (QUART)
NOTES:
C1 and C2 should be based on manufacturer’s specification.
X1 and X2 parasitic capacitance IS 1-2pF AND 3-5pF, respectively.
GAIN:
PHASE: at 4MHz 272 to 276 ; at 8MHz 272 to 276
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.
at 4MHz 8 to 14db; at 8MHz 2 to 6db
X1/CLK
CTCLK
RxC
TxC
(1X OUTPUT)
(INPUT)
TxC
TxD
TxC
C1 = C2 = 24pF FOR C
C1
C2
t
t
CLK
CTC
t
t
Rx
Tx
3.6864MHz
L
= 20PF
X1
X2
Figure 15. Transmit Clock Timing
t
TXD
Figure 14. Clock Timing
t
t
CLK
CTC
t
t
26C94
Rx
Tx
(1 OR 16 CLOCKS
t
1 BIT TIME
TCS
30
FREQUENCY:
LOAD CAPACITANCE (C
TYPE OF OPERATION:
4pF
3pF
50 KOHMs
TO
150 KOHMs
POWER DOWN
L
TYPICAL CRYSTAL SPECIFICATION
):
TO I/O CHANGE-OF-STATE DETECTORS
2 – 4MHZ
12 – 32pF
PARALLEL RESONANT, FUNDAMENTAL MODE
+5V
2
1K required for
38.4kHz CLOCK
NC
BRG
TTL gate.
MUX
SD00173
Product specification
SC28C94
22
STANDARD
BAUD
RATES
X1
X2
To
remainder
of circuit
SD00172