NJU3553 データシートの表示（PDF） - Japan Radio Corporation
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NJU3553 Datasheet PDF : 17 Pages
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NJU3553
s TERMINAL DESCRIPTION IN OTP PROGRAMMING MODE
No.
NJU NJU
3553L 3553M
27
29
24-26,
1-5
7,
8
16
15
17
6, 28
14
26-28,
1-3,
5, 6
8,
9
17
16
19
7, 30
15
SYMBOL
RESET
D0 - D7
CNT1
CNT2
REQ
CLK
PROM
VDD
VSS
INPUT /
OUTPUT
INPUT
FUNCTION
RESET terminal.
When the low-level input-signal, the system is initialized.
INPUT/OUTPUT Data bus
INPUT
INPUT
OUTPUT
INPUT
INPUT
-
-
OTP control input terminal
Request output terminal
Clock input terminal
OTP programming enable terminal
Power Source (5V)
Power Source (0V)
Note 1) Use at VDD=5V in OTP programming mode.
2) Non connect anything to the other terminals.
s Difference between NJU3553 (OTP version) and NJU3503 (MASK version)
q Operating mode
NJU3553 has two operating modes. One is ”Normal operating mode” and the other is “OTP programming
mode”.
• Normal operating mode
The ”TEST” terminal is set to low level. (The terminal is recommended to connect to GND.)
Operating voltage range; 2.7V ~ 5.5V.
• OTP Programming mode
User program is read out from or written into the OTP by the universal programmer “SUPERPRO/L” and
converting adapter made by XELTEK co,.(USA).
q Reset Terminal Type
Internal Pull-up Resistance
NJU3553
With Pull-up
NJU3503
Without Pull-up
q Option information set in the initialization
When the initialization is performed(RESET terminal is “L”), the operation information stored in option area is
set as shown in the following timing chart . The option information is set in the term of 1 / fOSC x 512clock after
RESET releasing and oscillation stability time. After information set, the program counter is set to 0000H and
the NJU3553 operates in normal.
[ TIMING CHART ]
Oscillation
Stability
Time
Option information setting
1/fOSCx512clock
Normal
Operation
Oscillator
Clock
Oscillation
Start
PC=0000H
RESET
fOSC=4MHz
about 128µsec
-3-
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