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參數資料
型號: MC145574
廠商: Motorola, Inc.
英文描述: ISDN S/T-Interface Transceiver
中文描述: 綜合業務數字網S / T的接口收發器
文件頁數: 63/164頁
文件大小: 1072K
代理商: MC145574
MC145574
7–1
MOTOROLA
The Motorola MC145574 ISDN S/T transceiver is available in a 28–pin SOIC and a 32–pin TQFP
package (see Figure 7–1).
Figure 7–1. Pin Assignments
28–LEAD SOIC
5
4
3
2
1
10
9
8
7
6
11
12
13
14
20
21
22
23
24
25
26
19
27
28
18
17
16
15
VSS
TE/NT
RxP
RxN
ISET
FSC/FSR
SG/DGRANT/ANDOUT
M/S
Dout
Din
DCL
T_IN/TFSC/TCLK/FIX
DREQUEST/ANDIN
CLASS/ECHO_IN
EXTAL
XTAL
TxN
TxP
RESET
SCPRx/S1/M1
SCPCLK/S2/M2
SCPEN/GCIEN
SCPTx/S0/M0
IRQ/IND
VDD I/O
VDD3
VDD5
TSEN/FST/BCL/LBA
TE/NT
M/S
T_IN/TSFC/TCLK/FIX
VSS
SG/DGRANT/ANDOUT
DREQUEST/ANDIN
CLASS/ECHO_IN
FSC/FSR
N
D
i
o
S
N
N
R
R
I
R
32 3130 2928 27 26 25
4
5
3
2
6
7
8
1
17
18
20
19
21
22
23
24
9 10 11 12 1314 15 16
VDD I/O
VDD3
IRQ/IND
XTAL
EXTAL
VDD5
TSEN/FSX/BCL/LBA
SCPEN/GCIEN
S
S
T
N
T
32–LEAD TQFP
The following pin descriptions are not intended to be exhaustive but merely indicate the operational
modes of the pins. For complete operational details please refer to the appropriate sections of this
document.
In both the NT and TE modes of operation, a current programming reference resistor of value
30 k
accurate to 5% should be connected between this pin and VSS. This resistor provides biasing
and programs the current limit for the TxP and TxN driver circuit. Note that this resistor is not user
programmable and must be 30 k
for CCITT 1.430, ETSI ETS 300012, and ANSI T1.605 compatibility.
These two pins form the differential receiver for the S/T–interface. They are connected to the S/T
loop via a transformer. For further information, refer to Section 16.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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