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TNETX3270
ThunderSWITCH 24/3 ETHERNET SWITCH
WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS
SPWS043B – NOVEMBER 1997 – REVISED APRIL 1999
63
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
power-up OSCIN and RESET
timing requirements (see Figure 23)
NO. MIN NOM MAX UNIT
Frequency drift, OSCIN clock ±50 ppm
1 t
c(OSCIN)
Cycle time, OSCIN 12 ns
2 t
w(OSCINL)
Pulse duration, OSCIN low 4.8 7.2 ns
3 t
w(OSCINH)
Pulse duration, OSCIN high 4.8 7.2 ns
4 t
w(RESET)
Pulse duration, RESET low 200 µs
5 t
su(RESET)
Setup time, RESET low before OSCIN↑ 7 ns
6 t
h(RESET)
Hold time, RESET low after OSCIN↑ 3 ns
7 t
d(OSCIN)
Delay time, from OSCIN invalid to OSCIN valid (stable) 25 ms
8 t
d(RESET)
Delay time, from OSCIN stable to RESET↑ 25 ms
9 t
t(OSCIN)
Transition time, OSCIN rise and fall 2 ns
RESET must be held low at least 25 ms after both power supplies are stable and OSCIN has reached its stable
operating frequency. RESET
can be set to 0 for a minimum of 200 µs to reset the device.
OSCIN
(input)
RESET
(input)
V
DD(2.5V)
(input)
V
DD(3.3V)
(input)
7
5
99
1
6
48
32
Figure 23. Power-Up OSCIN and RESET