SN75LP1185

LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS

SLLS335 – JANUARY 1999

5

POST OFFICE BOX 655303

driver switching characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPHL

Propagation delay time,

high- to low-level output

RL = 3 kΩ to 7 kΩ, CL = 15 pF, See Figure 1

300

800

1600

ns

tPLH

Propagation delay time,

low- to high-level output

RL = 3 kΩ to 7 kΩ, CL = 15 pF, See Figure 1

300

800

1600

ns

VCC = 5 V,

Using VTR = 10%-to-90% transition region,

Driver speed = 250 kbit/s, CL = 15 pF,

See Note 8

375

2240

tTLH

Transition time,

low to high level output

CC

VDD = 12 V,

VSS = –12 V,

RL 3kΩ to7kΩ

Using VTR = ±3 V transition region,

Driver speed = 250 kbit/s, CL = 15 pF

200

1500

ns

TLH

low- to high-level output

RL = 3 kΩ to 7 kΩ,

See Figure 1 and

Note 9

Using VTR = ±2 V transition region,

Driver speed = 250 kbit/s, CL = 15 pF

133

1000

Note 9

Using VTR = ±3 V transition region,

Driver speed = 125 kbit/s, CL = 2500 pF

2750

VCC = 5 V,

Using VTR = 10%-to-90% transition region,

Driver speed = 250 kbit/s, CL = 15 pF,

See Note 8

375

2240

tTHL

Transition time,

high to low level output

CC

VDD = 12 V,

VSS = –12 V,

RL 3kΩ to7kΩ

Using VTR = ±3 V transition region,

Driver speed = 250 kbit/s, CL = 15 pF

200

1500

ns

THL

high- to low-level output

RL = 3 kΩ to 7 kΩ,

See Figure 1 and

Note 9

Using VTR = ± 2 V transition region,

Driver speed = 250 kbit/s, CL = 15 pF

133

1000

Note 9

Using VTR = ±3 V transition region,

Driver speed = 125 kbit/s, CL = 2500 pF

2750

SR

Output slew rate

VCC = 5 V,

VDD = 12 V,

VSS = –12 V

Using VTR = ±3 V transition region,

Driver speed = 0 to 250 kbit/s, CL = 15 pF

4

20

30

V/

µs

NOTES:

8. Equivalent to the SN75C185. The SN75LP1185 output-voltage swing is clamped to about 70% of the typical SN75C185

output-voltage swing, and the specified limits reflect the reduced output swing.

9. Maximum output swing is limited to

±6 V to enable the higher data rates associated with this device and to reduce EMI emissions.

receiver electrical characteristics over recommended operating free-air temperature range

(unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIT+

Positive-going input threshold voltage

See Figure 3

1.6

2

2.55

V

VIT–

Negative-going input threshold voltage

See Figure 3

0.6

1

1.45

V

VHYS

Input hysteresis, VIT+ VIT–

See Figure 3

600

1000

mV

VOH

High-level output voltage

IOH = –1 mA

2.5

3.9

V

VOL

Low-level output voltage

IOL = 2 mA

0.33

0.5

V

IIH

High level input current

VI = 3 V

0.43

0.6

1

mA

IIH

High-level input current

VI = 25 V

3.6

5.1

8.3

mA

IIL

Low level input current

VI = –3 V

–0.43

–0.6

–1

mA

IIL

Low-level input current

VI = –25 V

–3.6

–5.1

–8.3

mA

IOS(H)

Short-circuit high-level output current

VO = 0,

See Figure 5 and Note 7

–20

mA

IOS(L)

Short-circuit low-level output current

VO = VCC,

See Figure 5 and Note 7

20

mA

RIN

Input resistance

VI = ±3 V to ±25 V

3

5

7

k

Ω

NOTE 7: Not more than one output should be shorted at one time.