ucb1100 NXP Semiconductors, ucb1100 Datasheet - Page 28

• Manufacturer Part Number: ucb1100
• Description: Advanced Modem/audio Analog Front-end
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.10 Reset Circuitry
The nreset signal is captured in the UCB1100 using a asynchronous
pulse stretching circuit. The nreset signal may be pulled down when
the sibclk is still stopped. The internal circuitry remembers this reset
signal and generates an internal reset signal from at least 5 sibclk
periods.
1998 May 08
SYMBOL
SYMBOL
Advanced modem/audio analog front-end
t
t
pclrsti
lnrst
t
rsti
internal reset
nreset
sibclk
count
arstn
nreset pulse width
width of internal reset signal
delay between rising edge sibclk and internal reset
tlnrst
PARAMETER
PARAMETER
Figure 35. Timing Diagram of the Reset Circuitry
0
28
trsti
CONDITIONS
CONDITIONS
NRESET
sibclk
Figure 34. Block Diagram of the Reset Circuitry
’1’
MIN
1
D
5
R
Q
5 * t
LIMITS
TYP
D
COUNT
sibclk
2
Q
Preliminary specification
MAX
D
25
arstn
3
UCB1100
Q
3
SN00160
internal
reset
SN00159
UNIT
UNIT
&
ns
ns
ns