Electrical Characteristics/Temperature Range

Parameter

Test ConditionsMin

Typ

Max

Unit

I

CC

Supply current

f = 20.5 MHz, V

-

50

75

mA

T

V

OH

High-level output voltage

I

2.4

3

-

V

I

V

-

-

V

V

OL

Low-level output voltage

I

-

0.3

0.6

V

I

OZ

Off-state output current

V

VO = 2.4 V

-

-

20

µA

VO = 0.4 V

-

-

-20

µA

I

I

Input current

V

Except CLKIN

-

-

±20

µA

CLKIN

-

-

±50

µA

C

I

Input capacitance

Data bus

f = 1 MHz, all other pins 0 V

-

25

-

pF

All others

-

15

-

pF

C

O

Output capacitance

Data bus

-

25

-

pF

All others

-

10

-

pF

Supply voltage range, V

CC

-0.3 V to 7 V

Input voltage range

-0.3 V to 15 V

Output voltage range

-0.3 V to 15 V

Ambient air temperature range

0˚ to 150˚C

Storage temperature range

-45˚C to 150˚C

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M-986-2A1

Rev. 3

Absolute Maximum Ratings are stress ratings. Stresses in

excess of these ratings can cause permanent damage to

the device. Functional operation of the device at these or

any other conditions beyond those indicated in the opera-

tional sections of this data sheet is not implied. Exposure of

the device to the absolute maximum ratings for an extend-

ed period may degrade the device and effect its reliability.

2

Absolute Maximum Ratings Over Specified

Temperature Range

When binary input/output is selected, the M-986-2A1

encodes the received R1 MF tone pair into a 4 bit

binary format. The digital input to the M-986-2A1 that

selects the transmitted R1 MF tone pair must also be

coded in a 4 bit binary format.

Enable/Disable Channel (ENC): When a channel is

disabled, the receiver does not process its codec

input for R1 MF tones, and the transmitter does not

respond to transmit commands. If a transmit com-

mand is given while the channel is enabled, the “tone

off” command must be given before the channel is dis-

abled. Disabling the channel does not automatically

shut off the transmitter. When a channel is enabled,

the receiver and transmitter for that channel function

normally.

Long/Short KP Tone Detection Time (KPL): When

long KP tone detection is selected, the minimum on

time for the KP tone to be detected is 55 milliseconds.

When short KP tone detection is selected, the mini-

mum on time for the KP tone to be detected is 30 mil-

liseconds (the same as the minimum on time for the

rest of the MF tones).

Enable MF Tone Detection After Reception of KP

(KPEN): When this feature is enabled, MF tone detec-

tion is enabled after reception of the KP tone, and dis-

abled after reception of ST, ST1, ST2, or ST3 tones.

When this feature is disabled, MF tone detection is

always enabled. Select A or µ-law input/output (AMU)

for A-law encoding, this bit is set to a 1, for µ-law

encoding it is set to 0.

Function Description

The M-986-2A1 can be set up for various modes of

operation by writing two configuration bytes to the

coprocessor port. The format of the two configuration

bytes is shown in the Configuration Table on page 3

and the configuration options are described in the fol-

lowing paragraphs.

Configuration Options

External/Internal Codec Clock (ECLK): If external

codec clocking is selected, an external clocking source

provides an 8 kHz transmit framing clock and an 8 kHz

receive framing clock. It also provides a serial bit clock

with a frequency that is a multiple of 8 kHz between

216 kHz and 2.496 MHz for exchange of data via the

serial ports. When internal codec clocking is selected,

the M-986-2A1 provides an 8 kHz framing clock and a

2.048 MHz serial bit clock.

2 of 6/Binary Input/Output (IOM): When the 2-of-6

input/output is selected, the M-986-2A1 encodes the

received R1 MF tone pair into a 6-bit format, where

each bit represents one of the six possible frequencies.

A logic high level indicates the presence of a frequen-

cy. The digital input to the M-986-2A1 that selects the

transmitted R1 MF tone pair must also be coded in the

2-of-6 format.