参数资料
型号: 74AC240B
厂商: STMICROELECTRONICS
元件分类: 总线收发器
英文描述: AC SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PDIP20
封装: PLASTIC, DIP-20
文件页数: 4/9页
文件大小: 219K
代理商: 74AC240B
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
74AC240
4/9
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = tf = 3ns)
(*) Voltage range is 3.3V
± 0.3V
(**) Voltage range is 5.0V
± 0.5V
CAPACITIVE CHARACTERISTICS
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/8 (per circuit)
TEST CIRCUIT
CL = 50pF or equivalent (includes jig and probe capacitance)
RL = R1 = 500 or equivalent
RT = ZOUT of pulse generator (typically 50)
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
TA = 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
tPLH tPHL Propagation Delay
Time
3.3(*)
1.5
5.7
8.0
1.5
9.0
1.5
11.0
ns
5.0(**)
1.5
4.2
6.5
1.5
7.0
1.5
8.5
tPZL tPZH Output Enable
Time
3.3(*)
1.5
7.0
10.5
1.5
11.0
1.5
13.0
ns
5.0(**)
1.5
5.0
8.0
1.5
8.5
1.5
10.5
tPLZ tPHZ Output Disable
Time
3.3(*)
1.5
7.0
10.5
1.5
11.5
1.5
13.5
ns
5.0(**)
1.5
6.5
9.0
1.5
9.5
1.5
11.0
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
TA = 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
CIN
Input Capacitance
5.0
5
pF
COUT
Output
Capacitance
5.0
9
pF
CPD
Power Dissipation
Capacitance (note
1)
5.0
fIN = 10MHz
21
pF
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
2VCC
tPZH, tPHZ
Open
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