MC145572APB Freescale Semiconductor, MC145572APB Datasheet - Page 124
MC145572APB
Manufacturer Part Number
MC145572APB
Description
IC ISDN INTERFACE TXCVER 44-LQFP
Manufacturer
Freescale Semiconductor
Type
Transceiverr
Specifications of MC145572APB
Protocol
RS232
Voltage - Supply
5V
Mounting Type
Surface Mount
Package / Case
44-LQFP
Number Of Line Interfaces
1
Control Interface
HDLC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Number Of Drivers/receivers
-
Lead Free Status / Rohs Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC145572APB
Manufacturer:
MOTOLOLA
Quantity:
672
Company:
Part Number:
MC145572APB
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
- Current page: 124 of 264
- Download datasheet (2Mb)
Freescale Semiconductor, Inc.
derived from the interrupts generated when the receive maintenance subchannel registers are
updated. Figures 7–2 and 7–3 show the appropriate timings. It is possible to configure the TxSFS/
SFAX/S0 pin as SFAX and use the pulse to generate a 12–ms periodic interrupt. Note though that
SFAX indicates the 2B+D frame in the IDL2 interface that will be transmitted onto the first 2B+D
position in basic frame 1 of the U–interface superframe. Due to the internal FIFOs, it is not possible
to guarantee a fixed time between SFAX and the location of the superframe marker on the U–inter-
face.
At the NT end, the ANSI T1.601 specification requires a turnaround delay of 60
2 quats. The
MC145572 has a 60–quat turnaround time. This means that the transmitted Superframe Sync word
occurs 60 quats later than the received Superframe Sync word. From an interrupt service routine
point of view, updating BR0, BR2, and R6, the worst case time should be assumed to be 60 quats
+ 117 quats = 177 quats, or 2.2 ms. The system software designer should allow extra margin to be
safe. A quat is 12.5 s in duration.
At the LT end of the loop, the received Superframe Sync word is 60 – 2 + 8 quats later than the
transmit Superframe Sync word. The 2–quat uncertainty comes from the ANSI T1.601 specification
for NT turnaround time of 60
2 quats on a 0 length loop. The + 8 figure includes worst case propa-
gation delay on an 18,000–foot loop. From an interrupt service routine point of view, the worst case
assumption is that the receive Superframe Sync word occurs 68 quats after the transmitted Super-
frame Sync word. For example, from Figure 7–3, the time between when R6 is updated with the
receive eoc data and when R6 must be updated with the transmitted eoc data, can be calculated
as follows: 117 – 68 = 49 quats or 612.5 s. The system software designer should leave extra margin
to be safe.
For More Information On This Product,
7–8
MC145572
MOTOROLA
Go to: www.freescale.com
Related parts for MC145572APB
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
CONTACTOR, 1NO, 110VAC, 14A, DIN RAIL
Manufacturer:
IMO PRECISION CONTROLS
Datasheet:
Part Number:
Description:
CONTACTOR, 1NO, 230VAC, 14A, DIN RAIL
Manufacturer:
IMO PRECISION CONTROLS
Datasheet:
Part Number:
Description:
CONTACTOR, 1NO, 24VAC, 14A, DIN RAIL
Manufacturer:
IMO PRECISION CONTROLS
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet: