MC145574AAER2 Freescale Semiconductor, MC145574AAER2 Datasheet - Page 63

• Manufacturer Part Number: MC145574AAER2
• Manufacturer: Freescale Semiconductor

Specifications of MC145574AAER2

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

MOTOROLA
7.2.1
7.2.2
7.1
7.2
INTRODUCTION
The Motorola MC145574 ISDN S/T transceiver is available in a 28–pin SOIC and a 32–pin TQFP
package (see Figure 7–1).
PIN DESCRIPTIONS
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.
ISET
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 V SS . 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.
RxN, RxP
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.
SG/DGRANT/ANDOUT
T_IN/TFSC/TCLK/FIX
DREQUEST/ANDIN
CLASS/ECHO_IN
FSC/FSR
TE/NT
ISET
D out
V SS
DCL
RxN
RxP
M/S
D in
Freescale Semiconductor, Inc.
28–LEAD SOIC
For More Information On This Product,
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5
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8
9
10
11
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14
28
27
26
25
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Go to: www.freescale.com
Figure 7–1. Pin Assignments
RESET
TxP
TxN
XTAL
EXTAL
V DD 5
V DD I/O
V DD 3
IRQ/IND
TSEN/FST/BCL/LBA
SCPEN/GCIEN
SCPCLK/S2/M2
SCPRx/S1/M1
SCPTx/S0/M0
MC145574
SG/DGRANT/ANDOUT
T_IN/TSFC/TCLK/FIX
DREQUEST/ANDIN
CLASS/ECHO_IN
FSC/FSR
TE/NT
PIN DESCRIPTIONS
V SS
M/S
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
32–LEAD TQFP
24
23
22
21
20
19
18
17
XTAL
EXTAL
V DD 5
V DD I/O
V DD 3
IRQ/IND
TSEN/FSX/BCL/LBA
SCPEN/GCIEN
7
7–1