XR16C872 Datasheet, PDF (48/60 Pages) Exar Corporation – DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER

XR16C872
DISCONTINUED
1284 Controller AC Electrical Characteristics
T =0° - 70°C (-40° - +85°C for Industrial grade packages), Vcc=3.3 - 5.0 V ± 10% unless otherwise specified.
A
Symbol
Parameter
Limits
3.3
Min Max
Limits
5.0
Min Max
Units
Conditions
T20 PD7-PD0, STROBE#, AUTOFD#, INIT,
SLCTIN# delay from IOW# inactive
T21 Interrupt delay from ACK#
T22 Interrupt pre-charge pulse at release
T23 TC pulse width
T24 TC active to DRQx inactive
T25 DRQx active to DACKx# active
T26 DRQx inactive delay from DACKx#
active
T27 PD7-PD0 setup to STROBE# active
T28 STROBE# width
T29 PD7-PD0 hold from STROBE# inactive
T30 PD7-PD0 hold from BUSY inactive
T31 STROBE# active to BUSY active
(handshake)
T32 BUSY inactive to STROBE# active
(cycle delay)
T33 PD7-PD0, AUTOFD# setup to STROBE#
active
T34 PD7-PD0, AUTOFD# hold from BUSY
active
T35 STROBE# inactive to BUSY inactive
T36 BUSY inactive to #STROBE active
T37 #STROBE active to BUSY active
T38 BUSY active to #STROBE inactive
T39 PD7-PD0, BUSY setup to ACK# active
T40 PD7-PD0 data hold from AUTOFD#
active
T41 ACK# inactive to AUTOFD# active
T42 AUTOFD# active to ACK# active
T43 ACK# active to AUTOFD# inactive
T44 AUTOFD# inactive to ACK# inactive
T45 Host address setup to IOW# active
T46 Host address hold from IOW# active
T47 Host data setup to IOW# active
T48 Host data hold from IOW# active
T49 IOW# active to IOCHRDY low
T50 IOCHRDY high to Host terminate
(IOW# inactive)
100 ns
60 ns
10 ns
60
ns
100 ns
0
ns
100 ns
600
ns
600
ns
450
ns
80
ns
500 ns
680
ns
0
60 ns
80
180 ns
0
ns
80
200 ns
0
ns
80
180 ns
0
ns
0
ns
80
200 ns
0
ns
80
200 ns
0
ns
40
ns
10
ns
0
20 ns
0
ns
0
20 ns
10
ns
Rev. 1.00
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