sm5128a1s Nippon Precision Circuits Inc, (NPC), sm5128a1s Datasheet - Page 8

• Manufacturer Part Number: sm5128a1s
• Description: Cb Transceiver System Lsi
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

EMG
EMG is the emergency channel select pin. The emer-
gency channel, channel 9, is selected when EMG is
HIGH, and the previously selected channel, deter-
UP and DN
UP and DN are the channel up/down control pins,
respectively. They also serve as the fast up/down
function controls, in addition to their step up/down
functions. The fast change function is selected and
the channel change cycle becomes faster when a key
corresponding to either input pin is pressed continu-
ously for a period longer than the wait time t
PLL DATA
CHO
EMG
UP,DN
PLL DATA
LD
LD
0 to 51.2ms
25.6mS
DISCONTINUED
3.2 to 9.6mS
25.6ms
25.6ms +Lock up time + 4.8ms
PRODUCT
W
.
51.2ms
51.2ms
t
W
=870.4ms
SM5128A1
mined by the state of pins UP and DN, is selected
when EMG is LOW or open. EMG incorporates a
pull-down resistor.
Channel up/down operation is selected when EMG
and PA are LOW. Up/down operation is disabled
when CE is LOW (standby mode) and when TR is
HIGH (transmit mode).
t
F
=102.4ms
25.6mS +Lock up time + 4.8mS
25.6ms
25.6ms +Lock up time + 4.8ms
NIPPON PRECISION CIRCUITS—8
51.2ms