Z84C90_12 Datasheet, PDF (45/56 Pages) Zilog, Inc. – KIO Serial/Parallel Counter/Timer

Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
38
Table 5. AC Characteristics of the Z84C90
8 MHz
10MHz^1,6 12.5MHz^1,6
No. Symbol
Parameter
Min Max Min Max Min Max U/M
Bus Interface Timing
1 TcC
Clock Cycle Time
125 DC 100 DC 80 DC ns
2 TwCh
Clock Pulse Width (High)
55 DC 42 DC 32 DC ns
3 TwCl
Clock Pulse Width (Low)
55 DC 42 DC 32 DC ns
4 TfC
5 TrC
Clock Fall Time
Clock Rise Time
10
10
10 ns
10
10
10 ns
6 TsA(Rlf)
Address, CS Setup to RD, IORQ 50
40
30
ns
Fall
7 TsRl(Cr)
RD, IORQ to ClockRise Setup
50
50
40
ns
8 Th
Hold Time for Specified Setup
15
15
15
ns
9 TdCr(DO)
CLOCK Rise to Data Out Delay
100
80
65 ns
10 TdRlr(DOz) RD, IORQ Rise to Data Out Float
75
60
55 ns
Delay
11 ThRDr(D)
M1,RD,IORQ Rise to Data Float 15
15
15
ns
12 TsD(Cr)
13 TdIOI(DOI)
14 ThIOr(D)
Data in to Clock Rise Setup
IORQ Fall to Data Out Delay
(INTACK Cycle)²
IORQ Rise to Data Float
(INTACK)
30
25
22
ns
95
95
95 ns
15
15
15
ns
15 THIOr(A)
IORQ Rise to Address Hold
15
15
15
ns
16 TsM1f(Cr)
M1 Fall to Clock Rise Setup
40
40
40
ns
17 TsM1r(Cf)
M1 Rise to Clock Fall Setup
–15
–15
–15
ns
(M1 Cycle)
18 TdM1f(IEOf) M1 Fall to IEO Fall Delay
–
–
–
ns
(Interrupt Immediately preceding
M1 Fall)³
19 TsIEI(IOf)
IEI to IORQ Fall Setup³
ns
Notes:
1. Maximum SIO data rate is f_CLOCK ÷ by 5, in which f_CLOCK = 1 ÷ T_CC.
2. For a Z80 CPU operating above 8MHz, one wait state is required to meet this parameter.
3. These daisy chain parameters include contributions from the PIO, SIO and CTC cells, and vary slightly
depending on how they are ordered by the KIO Command Register.
4. Counter mode only; when using a cycle time less than 3 TcC, parameter #37 must be met.
5. Units are TcC.
6. If the CPU is a Z80 CPU and if it is required to have multiple Z80 peripherals in the system, then the time period
between M1 to IORQ must be extended.
7. Any open-drain output must add a Register-Capacitor (RC) time constant to the specification value.
PS011804-0612
AC Characteristics