Integrated Circuits
Data Sheet
ET7273B
QUAD DIFFERENTIAL LINE DRIVER IC WITH OPEN-COLLECTOR OUTPUTS AND ENABLE FUNCTION
FEATURES
- Supply Voltage Range 3.5V to 30V
- Operation to 800KHz
- CMOS and TTL Compatible Inputs
- Outputs RS-422A Compatible
- High Impedance Buffered Inputs with Hysteresis
- NPN Open-Collector outputs
- 80mA peak SINK current
- Outputs Protected by Thermal Shut-Down
APPLICATIONS
- Optical Encoders
- Industrial Controls
DESCRIPTION
These line drivers are similar in function to the ET7272, only in an open -collector format. The VCC pin powers the internal logic only. Output voltage is dependent onthe customer supplied voltage, up to a maximum of 30V. There is essentially no difference in output swing or performance with V CC (LOGIC) values from 3.5V-30V. Internal clamp diodes allow trouble-free operation when driving cable lengths exceeding 100 meters. The outputs are protected by initiating shutdown when junciton temperatures exceed safe limits. This feature assures highly reliable operation in harsh environments. Heat sinking is aided by having pin 8 directly connected to the ASIC substrate inside the package.
ABSOLUTE MAXIMUM RATINGS
| Parameter |
Symbol |
Min. |
Max. |
Units |
Ref. |
| Operating Temperature Range |
TA |
-55 |
115 |
°C |
Note 1 |
| Supply Voltage Range |
VCC |
3.5 |
30 |
V |
- |
Unless otherwise specified, TA = 25°C and EN- <0.8V.
| Parameters |
Symbol |
Min. |
Typ. |
Max. |
Units |
Test Conditions |
| Overtemp Operate Point (junction) |
TJOP |
- |
172 |
- |
°C |
Note 1 |
| Overtemp Release Point (junction) |
TJRP |
- |
136 |
- |
°C |
Note 1 |
| Vcc Voltage Range |
Vcc |
3.5 |
5 |
30 |
V |
- |
| Supply Current Vcc1 |
Icc1 |
- |
- |
11.9 |
16.0 |
mA |
| Supply Current Vcc2 |
ICC2 |
- |
2.5 |
3.4 |
mA |
Vcc = 5V, EN- >2V |
| Supply Current Vcc3 |
Icc3 |
- |
12.1 |
18.5 |
mA |
Vcc = 30V |
| Supply Current Vcc4 |
ICC4 |
- |
2.6 |
3.5 |
mA |
Vcc = 30V, EN- > 2V |
| Enable Input Threshold |
VTHE |
0.8 |
1.5 |
2 |
V |
- |
| Enable Low Level Input Current |
IILE |
-10 |
0 |
10 |
A |
VIN = 0V, Vcc = 5V |
| Enable High Level Input Current |
IIHE |
- |
108 |
150 |
A |
VIN = 5V, Vcc = 5V |
| High Impedance Output Leakage |
IOZ |
-4.0 |
0.0 |
4.0 |
A |
Vcc = 5V, EN- > 2V, Output at 15V |
| Input Positive-Going Threshold |
VT+ |
1.05 |
1.25 |
1.45 |
V |
- |
| Input Negative-Going Threshold |
VT |
0.75 |
0.95 |
1.15 |
V |
- |
| Input Hysteresis |
VH |
- |
0.3 |
- |
V |
- |
| Low Level Input Current |
IIL |
- |
-0.1 |
-4.0 |
A |
VIN = 0V, Vcc = 5V |
| High Level Input Current |
IIH |
- |
0 |
4.0 |
A |
VIN = 5V, Vcc = 5V |
| Low Level Output1 |
VOL1 |
- |
375 |
500 |
mV |
IOL = 20mA, Vcc = 5V, VOC = 30V |
| Low Level Output2 |
VOL2 |
- |
370 |
500 |
mV |
IOL = 20mA, Vcc =30V, VOC = 30V |
| High Level Output Current1 |
IOH1 |
- |
0 |
10 |
A |
Vcc = 5V, VOC = 30V |
| High Level Output Current2 |
IOH2 |
- |
0 |
10 |
A |
Vcc = 30V, VOC = 30V |
Load is 470 ohms and 1000pF, output to its compliment, and 470 ohms each output to VOC.
| Parameters |
Symbol |
Min. |
Typ. |
Max. |
Units |
Test Conditions |
| Propagation delay, rising input 50% point to zero crossing of differential outputs |
TPLH |
- |
232 |
325 |
ns |
- |
| Propagation delay, falling input 50% point to zero crossing of differential outputs |
TPHL |
- |
236 |
330 |
ns |
- |
| Output Rise Time |
TR |
- |
516 |
722 |
ns |
- |
| Output Fall Time |
TF |
- |
516 |
722 |
ns |
- |
NOTES:
- This is not a test parameter, but for information only.
- Unused inputs should be connected to ground.
- Do not leave pin 12 open. In applications which do not use the enable function, this pin should be tied to ground.
| PACKAGE |
SUFFIX |
| Chip Only |
-C |
| 16 Lead SOIC |
-SOP |
ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT.
|
