Texas Instruments SN75207BD, SN75207BN, SN75207BNS Datasheet

SN75207B

DUAL SENSE AMPLIFIER FOR MOS MEMORIES

OR DUAL HIGH-SENSITIVITY LINE RECEIVERS

SLLS096C – JULY 1973 – REVISED MARCH 1997

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Plug-In Replacement for SN75107A and
SN75107B With Improved Characteristics

D

±10-mV Input Sensitivity

D

TTL-Compatible Circuitry

D

Standard Supply Voltages . . . ±5 V

D

Differential Input Common-Mode Voltage
Range of ±3 V

D

Strobe Inputs for Channel Selection

D

Totem-Pole Outputs

D

SN75207B Has Diode-Protected Input Stage
for Power-Off Condition

D

Sense Amplifier for MOS Memories

D

Dual Comparator

D

High-Sensitivity Line Receiver

description

The SN75207B is a terminal-for-terminal replacement for the SN75107B. The improved input sensitivity makes
it more suitable for MOS memory sense amplifiers and can result in faster memory cycles. Improved sensitivity
also makes it more useful in line-receiver applications by allowing use of longer transmission line lengths. The
SN75207B features a TTL-compatible, active-pullup output.

Input protection diodes are in series with the collectors of the differential-input transistors of the SN75207B.
These diodes are useful in certain party-line systems that may have multiple V

CC+

power supplies and may be

operated with some of the V

CC+

supplies turned off. In such a system, if a supply is turned off and allowed to

go to ground, the equivalent input circuit connected to that supply would be as follows:

Input

SN75207B

This would be a problem in specific systems that might have the transmission lines biased to some potential
greater than 1.4 V.

This device is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

DIFFERENTIAL INPUTS

STROBES

OUTPUT

A–B

G S

Y

VID ≥ 10 mV X X H

X L H

–10 mV < VID < 10 mV

L XH
HH Indeterminate
X L H

VID ≤ –10 mV

L XH
HHL

H = high level, L = low level, X = irrelevant

Copyright  1997, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1
2
3
4
5
6
7

14
13
12
11
10

9
8

1A
1B

NC

1Y

1G

S

GND

V

CC+

V

CC–

2A
2B
NC
2Y
2G

N PACKAGE

(TOP VIEW)

NC – No internal connection

SN75207B
DUAL SENSE AMPLIFIER FOR MOS MEMORIES
OR DUAL HIGH-SENSITIVITY LINE RECEIVERS

SLLS096C – JULY 1973 – REVISED MARCH 1997

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

2G

2B

2A

1G

1B

1A

S

8

11

12

5

2

1

6

EN

9

2Y

1Y

4

&

†

This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.

logic diagram (positive logic)

1Y

4

2Y

9

11

2B

12

2A

8

2G

5

1G

2

1B

1A

S

1

6

schematic (each receiver)

4 kΩ

4.25 kΩ

6

5, 8

GND

7

4, 9

3 kΩ3 kΩ

800 Ω

1 kΩ

760 Ω

4.8 kΩ

120 Ω

1.6 kΩ

400 Ω1 kΩ1 kΩ

13

V

CC–

2, 11

B

Inputs

A

1, 12

14

V

CC+

To Other Receiver

Y

G

S

Resistor values shown are nominal.

Common
To Both
Receivers

SN75207B

DUAL SENSE AMPLIFIER FOR MOS MEMORIES

OR DUAL HIGH-SENSITIVITY LINE RECEIVERS

SLLS096C – JULY 1973 – REVISED MARCH 1997

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

design characteristics

The SN75207B line receivers/sense amplifiers are TTL-compatible, dual circuits intended for use in high-speed,
data-transmission systems or MOS memory systems. They are designed to detect low-level differential signals
in the presence of common-mode noise and variations of temperature and supplies. The dc specifications
reflect worst-case conditions of temperature, supply voltages, and input voltages.

The input common-mode voltage range is ±3 V. This is adequate for application in most systems. In systems
with requirements for greater common-mode voltage range, input attenuators may be used to decrease the
noise to an acceptable level at the receiver-input terminals.

The circuits feature individual strobe inputs for each channel and a strobe input common to both channels for
logic versatility . The strobe inputs are tested to ensure 400 mV of dc noise margin when interfaced with Series
54/74 TTL.

The circuits feature high input impedance and low input currents, which induce very little loading on the
transmission line. This makes these devices especially useful in party-line systems. The excellent input
sensitivity (3 mV typical) is particularly important when data is to be detected at the end of a long transmission
line and the amplitude of the data has deteriorated due to cable losses. The circuits are designed to detect input
signals of 10-mV (or greater) amplitude and convert the polarity of the signal into appropriate TTL-compatible
output logic levels.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

†

Supply voltage, V

CC+

(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply voltage, V

CC–

(see Note 1) –7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Differential input voltage, V

ID

(see Note 2) ±6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Common-mode input voltage, V

IC

(see Note 3) ±5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Strobe input voltage 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

A

0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: A. All voltage values, except differential voltages, are with respect to GND terminal.

1. Differential input voltage values are at the noninverting (A) terminal with respect to the inverting (B) terminal.

2. Common-mode input voltage is the average of the voltages at the A and B inputs.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

N 1050 mW 9.2 mW/°C 636 mW