M-986-2A1 Datasheet, PDF (2/13 Pages) Clare, Inc. – MF Transceiver

M-986-2A1
Absolute Maximum Ratings Over Specified
Temperature Range
Supply voltage range, V_CC
Input voltage range
Output voltage range
Ambient air temperature range
Storage temperature range
-0.3 V to 7 V
-0.3 V to 15 V
-0.3 V to 15 V
0˚ to 150˚C
-45˚C to 150˚C
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.
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.
Electrical Characteristics/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.
Parameter
Test ConditionsMin
I_CC Supply current
f = 20.5 MHz, V_CC = 5.5V,
T_A = 0˚ to 70 ˚C
V_OH High-level output voltage
I_OH = MAX
I_OH = 20 µ A
V_OL Low-level output voltage
I_OL = MAX
I_OZ Off-state output current
V_CC = MAX
VO = 2.4 V
VO = 0.4 V
I_I Input current
V_I = V_SS to V_CC Except CLKIN
CLKIN
C_I Input capacitance Data bus
All others
f = 1 MHz, all other pins 0 V
C_O Output capacitance Data bus
All others
Typ
Max
Unit
-
50
75
mA
2.4
3
-
V
V_CC -0.4
-
-
V
-
0.3
0.6
V
-
-
20
µA
-
-
-20
µA
-
-
±20
µA
-
-
±50
µA
-
25
-
pF
-
15
-
pF
-
25
-
pF
-
10
-
pF
2
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Rev. 3