參數(shù)資料
型號(hào): W78L33
文件頁(yè)數(shù): 8/14頁(yè)
文件大?。?/td> 131K
代理商: W78L33
W78L33
- 8 -
DC Characteristics, continued
PARAMETER
SYM.
SPECIFICATION
MIN.
2.4
1.4
UNIT
TEST CONDITIONS
MAX.
-
-
Output High Voltage
V
OH2
V
V
V
DD
= 4.5V, I
OH
= -400
μ
A
V
DD
= 2.0V, I
OH
= -200
μ
A
P0, ALE, PSEN [*2]
Source Current
P1, P2, P3, P4
Source Current
I
SR1
-100
-12
-8
-1.4
-250
-30
-16
-2.4
μ
A
μ
A
mA
mA
V
DD
= 4.5V, Vin = 2.4V
V
DD
= 2.0V, Vin = 1.4V
V
DD
= 4.5V, Vin = 2.4V
V
DD
= 2.0V, Vin = 1.4V
I
SR2
P0, ALE, PSEN
Notes:
*1. RST pin is a Schmitt trigger input.
*2. P0, ALE and /PSEN are tested in the external access mode.
*3. XTAL1 is a CMOS input.
*4. Pins of P1, P2, P3, P4 can source a transition current when they are being externally driven from 1 to 0.
AC CHARACTERISTICS
The AC specifications are a function of the particular process used to manufacture the part, the
ratings of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the
specifications can be expressed in terms of multiple input clock periods (T
CP
), and actual parts will
usually experience less than a
±
20 nS variation. The numbers below represent the performance
expected from a 0.5 micron CMOS process when using 2 and 4 mA output buffers.
Clock Input Waveform
T
T
XTAL1
F
CH
CL
OP,
T
CP
PARAMETER
Operating Speed
Clock Period
Clock High
Clock Low
SYMBOL
F
OP
T
CP
T
CH
T
CL
MIN.
0
25
10
10
TYP.
-
-
-
-
MAX.
24
-
-
-
UNIT
MHz
nS
nS
nS
NOTES
1
2
3
3
Notes:
1. The clock may be stopped indefinitely in either state.
2. The T
CP
specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
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