DP8570 NSC [National Semiconductor], DP8570 Datasheet - Page 3

• Manufacturer Part Number: DP8570
• Description: Timer Clock Peripheral (TCP)
• Manufacturer: NSC [National Semiconductor]

READ TIMING
WRITE TIMING
TIMER 0 TIMER 1 TIMING
INTERRUPT TIMING
AC Electrical Characteristics
V
Note 9 Read Strobe width as used in the read timing table is defined as the period when both chip select and read inputs are low Hence read commences when
both signals are low and terminates when either signal returns high
Note 10 Hold time is guaranteed by design but not production tested This limit is not used to calculate outgoing quality levels
Note 11 Write Strobe width as used in the write timing table is defined as the period when both chip select and write inputs are low Hence write commences when
both signals are low and terminates when either signal returns high
Note 12 Timers in Mode 3
Note 13 Guaranteed by design not production tested This limit is not used to calculate outgoing quality levels
AC Test Conditions
Note 14 C
Note 15 S1
Capacitance
Note 16 This parameter is not 100% tested
Note 17 Output rise and fall times 25 ns max (10%–90%) with 100 pF load
CC
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
F
t
t
t
t
t
Symbol
C
C
AR
RW
CD
RAH
RD
DZ
RCH
DS
AW
WAH
CW
WW
DW
WDH
WCH
CK
GO
PGW
GS
ROLL
TCK
Input Pulse Levels
Input Rise and Fall Times
Input and Output
Reference Levels
TRI-STATE Reference
Levels (Note 15)
IN
OUT
e
S1
S1
5V
L
e
e
e
e
g
GND for active high to high impedance measurements
open for all other timing measurements
100 pF includes jig and scope capacitance
V
10% V
CC
Input Capacitance
Output Capacitance
for active low to high impedance measurements
Parameter
BB
Address Valid Prior to Read Strobe
Read Strobe Width (Note 9)
Chip Select to Data Valid Time
Address Hold after Read (Note 10)
Read Strobe to Valid Data
Read or Chip Select to TRI-STATE
Chip Select Hold after Read Strobe
Minimum Inactive Time between Read or Write Accesses
Address Valid before Write Strobe
Address Hold after Write Strobe (Note 10)
Chip Select to End of Write Strobe
Write Strobe Width (Note 11)
Data Valid to End of Write Strobe
Data Hold after Write Strobe (Note 10)
Chip Select Hold after Write Strobe
Input Frequency Range
Propagation Delay Clock to Output
Propagation Delay G0 to G1
to Timer Output (Note 12)
Pulse Width G0 or G1
Setup Time G0 G1 to TCK (Note 13)
Clock Rollover to INTR Out is Typically 16 5 s
(Note 16)
(T
A
e
e
3V V
25 C f
PFAIL l
e
Active High
Active Low
6 ns (10%–90%)
1 MHz)
GND to 3 0V
V
Typ
IH
5
7
Parameter
1 3V
C
(Note 12)
L
b
a
e
0 5V
0 5V
Units
100 pF (unless otherwise specified)
pF
pF
3
Min
100
DC
20
80
50
20
90
80
50
25
3
0
3
3
0
Max
120
100
80
70
60
10
TL F 8638 – 23
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns