UMA1017M Datasheet, PDF (10/16 Pages) NXP Semiconductors – Low-voltage frequency synthesizer for radio telephones

Philips Semiconductors
Low-voltage frequency synthesizer
for radio telephones
Product specification
UMA1017M
SERIAL BUS TIMING CHARACTERISTICS
V_DD = V_CC = 3 V; T_amb = 25 °C unless otherwise specified.
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
Serial programming clock; CLK
t_r
input rise time
t_f
input fall time
T_cy
clock period
Enable programming; E
t_START
t_END
t_W
t_SU;E
delay to rising clock edge
delay from last falling clock edge
minimum inactive pulse width
enable set-up time to next clock edge
Register serial input data; DATA
t_SU;DAT
t_HD;DAT
input data to clock set-up time
input data to clock hold time
−
10
40
ns
−
10
40
ns
100
−
−
ns
40
−
−
ns
−20
−
−
ns
4 000⁽¹⁾
−
−
ns
20
−
−
ns
20
−
−
ns
20
−
−
ns
Note
1. The minimum pulse width (t_W) can be smaller than 4 µs provided all the following conditions are satisfied:
a) Main divider input frequency f_VCO > ^2--t--5_W---6--
b) Reference divider input frequency f_XTAL > _t--3W---
1995 Jul 10
Fig.3 Serial bus timing diagram.
10