74LV245 Ver la hoja de datos (PDF) - Philips Electronics
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74LV245 Datasheet PDF : 12 Pages
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Philips Semiconductors
Octal bus transceiver (3-State)
Product specification
74LV245
AC CHARACTERISTICS
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL = 1KΩ
SYMBOL
PARAMETER
tPHL/tPLH
Propagation delay
An to Bn;
Bn to An
WAVEFORM
Figures 1
CONDITION
VCC(V)
1.2
2.0
2.7
3.0 to 3.6
4.5 to 5.5
1.2
tPZH/tPZL
3-State output enable time
OE to An;
OE to Bn
Figures 2
2.0
2.7
3.0 to 3.6
4.5 to 5.5
1.2
tPHZ/tPLZ
3-State output disable time
OE to An;
OE to Bn
Figures 2
2.0
2.7
3.0 to 3.6
4.5 to 5.5
NOTES:
1. Unless otherwise stated, all typical values are measured at Tamb = 25°C
2. Typical values are measured at VCC = 3.3 V.
3. Typical values are measured at VCC = 5.0 V.
LIMITS
–40 to +85 °C
MIN TYP1 MAX
45
28
15
28
11
19
92
16
83
11
–40 to +125 °C
MIN MAX
34
24
20
14
55
19
31
39
14
23
29
102
18
23
8.53
14
18
65
24
32
39
18
24
29
142
20
24
11.53
16
19
UNIT
ns
ns
ns
AC WAVEFORMS
VM = 1.5 V at VCC ≥ 2.7 V and ≤ 3.6 V
VM = 0.5 V × VCC at VCC < 2.7 V and ≥ 4.5 V
VOL and VOH are the typical output voltage drop that occur with the output load.
VX = VOL + 0.3 V at VCC ≥ 2.7 V and ≤ 3.6 V
VX = VOL + 0.1 × VCC at VCC < 2.7 V and ≥ 4.5 V
VY = VOH – 0.3 V at VCC ≥ 2.7V and ≤ 3.6 V
VY = VOH – 0.1 × VCC at VCC < 2.7 V and ≥ 4.5 V
An, Bn INPUT
VM
tPHL
tPLH
Bn, An OUTPUT
VM
SV00627
Figure 1. Input (An, Bn) to output
(Bn, An) propagation delays and the output transition times.
VI
OE INPUT
GND
VCC
OUTPUT
LOW-to-OFF
OFF-to-LOW
VOL
VOH
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
GND
VM
tPLZ
tPZL
VX
tPHZ
VM
tPZH
VY
VM
outputs
enabled
outputs
disabled
outputs
enabled
SV00628
Figure 2. 3-State enable and disable times.
1998 Apr 20
6
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