Intel 8253 - 2 D C Characteristics; Table 7-1 D C Specifications

Intel387
TM
SX MATH COPROCESSOR
7.2 D.C. Characteristics
Table 7-1. D.C. Specifications T
C
e
0
§
Cto
a
100
§
C, V
CC
e
5V
g
10%
Symbol Parameter Min Max Units Test Conditions
V
IL
Input LO Voltage
b
0.3
a
0.8 V (Note 1)
V
IH
Input HI Voltage 2.0 V
CC
a
0.3 V (Note 1)
V
CL
CPUCLK2 and NUMCLK2
Input LO Voltage
b
0.3
a
0.8 V
V
CH
CPUCLK2 and NUMCLK2
Input HI Voltage V
CC
b
0.8 V
CC
a
0.8 V
V
OL
Output LO Voltage 0.45 V (Note 2)
V
OH
Output HI Voltage 2.4 V (Note 3)
V
OH
Output HI Voltage V
CC
b
0.8 V (Note 4)
I
CC
Power Supply Current
Dynamic Mode
Freq.
e
33 MHz
(5)
150 mA I
CC
typ.
e
135 mA
Freq.
e
25 MHz
(5)
150 mA I
CC
typ.
e
130 mA
Freq.
e
20 MHz
(5)
125 mA I
CC
typ.
e
110 mA
Freq.
e
16 MHz
(5)
100 mA I
CC
typ.
e
90 mA
Freq.
e
1 MHz
(5)
20 mA I
CC
typ.
e
5mA
Idle Mode
(6)
7mAI
CC
typ.
e
4mA
I
LI
Input Leakage Current
g
15 mA0V
s
V
IN
s
V
CC
I
LO
I/O Leakage Current
g
15 mA 0.45V
s
V
O
s
V
CC
C
IN
Input Capacitance 7 10 pF f
c
e
1 MHz
C
O
I/O Capacitance 7 12 pF f
c
e
1 MHz
C
CLK
Clock Capacitance 7 20 pF f
c
e
1 MHz
NOTES:
1. This parameter is for all inputs, excluding the clock inputs.
2. This parameter is measured at I
OL
as follows:
Data
e
4.0 mA
READYO
Ý
, ERROR
Ý
, BUSY
Ý
, PEREQ
e
25 mA
3. This parameter is measured at I
OH
as follows:
Data
e
1.0 mA
READYO
Ý
, ERROR
Ý
, BUSY
Ý
, PEREQ
e
0.6 mA
4. This parameter is measured at I
OH
as follows:
Data
e
0.2 mA
READYO
Ý
, ERROR
Ý
, BUSY
Ý
PEREQ
e
0.12 mA
5. Synchronous Clock Mode (CKM
e
1). I
CC
is measured at steady state, maximum capacitive loading on the outputs, and
worst-case D.C. level at the inputs.
6. Intel387 SX Math CoProcessor Internal Idle Mode. Synchronous clock mode, clock and control inputs are active but the
Math CoProcessor is not executing an instruction. Outputs driving CMOS inputs.
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