Z84C90_12 Datasheet, PDF (47/56 Pages) Zilog, Inc. – KIO Serial/Parallel Counter/Timer

Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
40
Table 5. AC Characteristics of the Z84C90 (Continued)
8 MHz
10MHz^1,6 12.5MHz^1,6
No. Symbol
Parameter
Min Max Min Max Min Max U/M
PIO Timing (continued)
35 TdCr(PD)
Clock Rise to Port Data Valid
Delay
80
80
80 ns
CTC Timing
36 TdCr(INTf) Clock Rise to INT Rise Delay
TcC+100
TcC+80
TcC+75 ns
37 TsCTRr(Cr)c CLK/TRG Rise to Clock Rise
90
90
75
ns
Setup (for immediate count,
Counter mode)
38 TsCTRr(Cr)t CLK/TRG Rise to Clock Rise
90
90
75
ns
Setup (for enabling prescaler on
following ClockRise, Timer mode)
39 TdCTRr(INTf) CLK/TRG Rise to INT Fall Delay
ns
TsCTRr(Cr) satisfied
(36)+(38) (36)+(38) (36)+(38)
TsCTRr(Cr) not satisfied
(1)+(36)+(38) (1)+(36)+(38) (1)+(36)+(38)
40 TcCTR
CLK/TRG Cycle Time⁴
(2TcC) DC (2TcC) DC (2TcC) DC ns
41 TwCTRh
CLK/TRG Width High
90 DC 90 DC 75 DC ns
42 TwCTRI
CLK/TRG Width Low
90 DC 90 DC 75 DC ns
43 TrCTR
CLK/TRG Rise Time
30
30
30 ns
44 TfCTR
CLK/TRG Fall Time
30
30
30 ns
45 TdCr(ZCr)
Clock Rise to ZC/TO Rise Delay
80
80
80 ns
46 TdCf(ZCf)
Clock Fall to ZC/TO Fall Delay
80
80
80 ns
SIO Timing
47 TdIOf(W/Rf) IORQ Fall to WT/RDY Fall Delay
130
110
110 ns
(Wait Mode)
48 TdCr(W/Rf)
Clock Rise to WT/RDY Delay 
(Ready Mode)
85
85
85 ns
49 TdCf(W/Rz) Clock Fall to WT/RDY Float Delay
(Wait Mode)⁷
90+RC
80+RC
75+RC 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