NOTICE: Stresses above those listed under "Absolute Maximums Rating" may cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
T
C
Parameter
Power Supply Voltage
Input High Voltage
Input Low Voltage
Case Operating Temperature (Military)
Minimum
+4.5
+2.0
-0.5
-55
Maximum
+5.5
V
CC
+ 0.3
+0.8
+125
Units
V
V
V
°C
A
Capacitance
(V
IN
= 0V, f = 1MHz, T
C
= 25°C)
Symbol
C
AD
C
OE
C
WE
(1-4)
C
CE
(1-4)
C
I
/
O
Parameter
A
0
– A
16
Capacitance
Output Enable Capacitance
Write Enable Capacitance
Chip Enable Capacitance
I/O0 – I/O31 Capacitance
Maximum
50
50
20
20
20
Units
pF
pF
pF
pF
pF
DC Characteristics
(Vcc = 5.0V, Vss = 0V, T
C
= -55°C to +125°C, unless otherwise specified)
Parameter
Input Leakage Current
Output Leakage Current
Operating Supply Current x 32 Mode
Operating Supply Current
Output Low Voltage
Output High Voltage
Sym
I
LI
Conditions
V
CC
= 5.5V, V
IN
= GND to V
CC
Minimum
Maximum
10
10
250
5
0.45
Units
µA
µA
mA
mA
V
V
I
LO
X
32
CE = OE = V
IH
,
V
OUT
= GND to V
CC
I
CC
X
32
CE = V
IL
,
OE = V
IH
, f = 5Mhz
I
SB
V
OL
V
OH
CE = V
IH
, OE = V
IH
,
f = 5Mhz
I
OL
= +2.1mA, V
CC
= 4.5V
I
OH
= –400µA, V
CC
= 4.5V
2.4
Truth Table
CE
H
L
L
X
X
X
OE
X
L
H
H
X
L
WE
X
H
L
X
H
X
Mode
Standby
Read
Write
Out Disable
Write
Inhibit
Data I/O
High Z
Data Out
Data In
High Z
-
-
Aeroflex Circuit Technology
2
SCD1662 REV C 9/6/02 Plainview NY (516) 694-6700
AC Write Characteristics
(V
CC
= 5V, V
SS
= 0V, T
C
= -55°C to +125°C)
Parameter
Write Cycle Time
Address Set-up Time
Write Pulse Width (WE or CE)
Chip Enable Set-up Time
Address Hold Time
Data Hold Time
Chip Enable Hold Time
Data Set-up Time
Output Enable Set-up Time
Output Enable Hold Time
Symbol
t
WC
t
AS
t
WP
t
CE
t
AH
t
DH
t
CEH
t
DS
t
OES
t
OEH
Min
10
150
0
100
10
0
100
10
10
Max
10
Units
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
A
AC Read Characteristics
(V
CC
= 5V, V
SS
= 0V, T
C
= -55°C to +125°C)
Read Cycle Parameter
Read Cycle Time
Address Access Time
Chip Enable Access Time
Output Hold From Address Change,
OE or CE
Output Enable to Output Valid
Chip Enable or OE to High Z Output
Symbol
t
RC
t
ACC
t
ACE
t
OH
t
OE
t
DF
–120
Min
120
120
120
0
0
55
70
0
0
–140
140
140
140
0
55
70
0
–150
150
150
150
0
55
70
0
–200
200
200
200
0
55
70
0
–250
250
250
250
0
85
70
0
–300
Max
300
300
300
Max Min
Max Min
Max Min
Max Min
Max Min
Units
ns
ns
ns
ns
85
70
ns
ns
Page Write Characteristics
(V
CC
= 5V, V
SS
= 0V, T
C
= -55°C to +125°C)
Parameter
Write Cycle Time
Address Set-up Time
Address Hold Time , See Note 1
Data Set-up Time
Data Hold Time
Write Pulse Width
Byte Load Cycle Time
Write Pulse Width High
Note 1 – Page Address must remain valid for duration of write cycle.
SMT贴片机是表面贴装技术（Surface Mount Technology）中的重要设备，它的性能状态对电子制造的质量和效率有着决定性的影响。因此，对SMT贴片机的主要指标性能进行定期检测非常重要。以下是一些主要的检测项目： 定位精度：定位精度是SMT贴片机的核心性能指标，它直接影响到贴片的准确性。通常，我们通过重复测量贴片机在X、Y轴上的移动误差来检测其定位精度。 贴片速度：贴片速度...[详细]
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