UPD9903 Datasheet, PDF (9/28 Pages) NEC – UPD9903 ANALOG SUBSCRIBER LINE LSI DIGITAL CODEC

µPD9903
(2) AC conditions
Parameter
Data clock frequency
Data clock pulse width
Frame sync clock frequency
High level frame sync pulse
width
Low level frame sync pulse
width
Clock rise time
Clock fall time
Float in sync timing
High level width of frame
sync clock and data clock
HWR set-up time
HWR hold time
Minimum width of reset pulse
Symbol
fDCLK
tDCLK
fS
tWHS
Conditions
(= 1/tCY) ± 50 ppm
± 50 ppm
tWLS
tR
tF
tCSD1
tCSD2
tWHSC
tDSR
tDHR
PWRST
Note 1
Note 1
RST pin ^{Note 2}
MIN.
200
tCY × 8
TYP.
2048
8.0
MAX.
Units
kHz
ns
kHz
ns
tCY × 8
ns
30
ns
30
ns
100
ns
40
ns
100
ns
65
ns
120
ns
10
µs
Notes 1. During timing measurement, use 5 ns as the rise time and fall time for the digital input wave form and
clock signal.
2. The µPD9903 is initialized when high level input is applied to the RST pin after applying low level input
for several clock widths. (However, use of the RST pin is not guaranteed during low level input. Also,
low level input alone does not initialize the µPD9903.)
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