MT88E43AS Zarlink Semiconductor, Inc., MT88E43AS Datasheet - Page 22

• Manufacturer Part Number: MT88E43AS
• Description: Extended Voltage Calling Number Identification Circuit 2
• Manufacturer: Zarlink Semiconductor, Inc.

MT88E43
Notes:
This on-hook case application is included because a CIDCW (off-hook) CPE should also be capable of receiving on-hook data
transmission (with ringing) from the end office. TR-NWT-000575 specifies that CIDCW will be offered only to lines which subscribe to
CID.
1) The CPE designer may choose to enable the MT88E43 only after the end of ringing to conserve power in a battery operated CPE. CD is not
2) The CPE designer may choose to set FSKen always high while the CPE is on-hook. Setting FSKen low prevents the FSK
3) The microcontroller in the CPE powers down the MT88E43 after CD has become inactive.
4) The microcontroller times out if CD is not activated.
5-74
activated by ringing.
demodulator from reacting to other in-band signals such as speech, CAS or DTMF tones.
TIP/RING
TRIGout
PWDN
OSCout
FSKen
CD
DR
DCLK
DATA
Figure 19 - Input and Output Timing for Bellcore On-hook Data Transmission Associated with
1st Ring
Note 1
Note 2
A
t
PU
B
Ch. seizure
t
CP
.101010..
C
Mark
Ringing, e.g., CID
D
Data Packet
Data
E
t
CA
Note 3
t
F
PD
A = 2sec typical
B = 250-500ms
C = 250ms
D = 150ms
E = feature specific
Max C+D+E = 2.9 to 3.7sec
F
2nd Ring
Note 1
200ms
Data Sheet
Note 4