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| 型號： | 935261296518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), 500K bps, SERIAL COMM CONTROLLER, PQCC68 |
| 封裝： | PEDESTAL, PLASTIC, MO-047, SOT-188-3, LCC-68 |
| 文件頁數(shù)： | 40/52頁 |
| 文件大?。?/td> | 303K |
| 代理商： | 935261296518 |
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Philips Semiconductors
Product specification
SC28L194
Quad UART for 3.3V and 5V supply voltage
2001 Feb 13
45
SCLK
IACKN
CEN
W_RN
ADDRESS
DATA
DACKN
INVALID
DON’T CARE
C1
C2
C3
C4
VALID
tCS
tRWS
tAS
tAH
tDD
DAKDLY
C4
DAKDLY
CEN
HIGH
tDF
INVALID
DON’T CARE
NOTE:
CEN must not be active during an IACKN cycle. If CEN is active, IACKN will be ignored
and a normal read or write will be executed according to W_RN. In the synchronous
mode, extended IACKN signal will start another IACKN. (This may not be desired, but
is allowed.)
SD00525
Figure 8.
Basic IACKN Cycle, ASYNC/SYNC
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.
fX1
+5V
1K required for
TTL gate.
X1
X2
C1 = C2 = 24pF FOR CL = 20pF
X1
X2
3.6864MHz
3pF
4pF
50 KOHMs
TO
150 KOHMs
28C194
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°
The above figures for 5V operation. Operation at 3V is to be determined.
TYPICAL CRYSTAL SPECIFICATION
FREQUENCY:
2 – 4MHZ
LOAD CAPACITANCE (CL):
12 – 32pF
TYPE OF OPERATION:
PARALLEL RESONANT, FUNDAMENTAL MODE
NC
C1
C2
MUX
To
remainder
of circuit
÷ 2
38.4kHz CLOCK
BRG
TO I/O CHANGE-OF-STATE DETECTORS
22
STANDARD
BAUD
RATES
X1 L/H
T/R fX1
SD00670
Figure 9.
X1/X2 Communication Crystal Clock
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