參數(shù)資料
型號(hào): MC145574
廠商: Motorola, Inc.
英文描述: ISDN S/T-Interface Transceiver
中文描述: 綜合業(yè)務(wù)數(shù)字網(wǎng)S / T的接口收發(fā)器
文件頁數(shù): 130/164頁
文件大?。?/td> 1072K
代理商: MC145574
MC145574
18–8
MOTOROLA
(TA = – 40 to + 85
°
C, VDD = 5.0 V
±
5%, Voltages Referenced to VSS)
Ref. No.
Characteristic
Min
Max
Unit
12
SCPEN Active Before Rising Edge of SCPCLK
50
ns
13
SCP Rising Edge Before SCPEN Active
50
ns
14
SCP Rx Valid Before SCPCLK Rising Edge (Setup Time)
20
ns
15
SCP Rx Valid After SCPCLK Rising Edge (Hold Time)
20
ns
16
SCPCLK Period (Note 1)
244
ns
17
SCPCLK Width (Low)
30
ns
18
SCPCLK Width (High)
30
ns
19
SCP Tx Active Delay
50
ns
20
SCPEN Active to SCP Tx Active
50
ns
21
SCPCLK Falling Edge to SCP Tx High–Impedance
40
ns
22
SCPEN Inactive Before SCPCLK Rising Edge
50
ns
23
SCPCLK Rising Edge Before SCPEN Inactive
50
ns
24
SCPCLK Falling Edge to SCP Tx Valid Data
50
ns
NOTE:
1. Maximum SCP Clock Frequency is 4.096 MHz.
Figure 18–4. SCP Timing Characteristics
NOTES:
1. During a nibble read, four bits are presented on SCP Rx.
2. During a nibble read, SCP Tx will be active for the duration of the 4–bit transmission as shown.
3. During a byte read, eight bits are presented on SCP Rx. A byte transaction consists of two 8–bit ex-
changes. During the second 8–bit exchange, data is either written to the byte from SCP Rx or is read
from the byte. If the operation is a read operation, then data is presented onto SCP Tx. Refer to Section 5,
“The Serial Control Port”, for a detailed description.
SCP EN
SCPCLK
SCP Rx
(NOTE 1)
SCP Tx
(NOTE 2)
SCP Tx
(NOTE 3)
1
2
3
4
5
6
7
8
12
13
14
15
16
17
18
19
20
21
22
24
SCP Rx
(NOTE 3)
23
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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