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參數(shù)資料
| 型號(hào)： | μPD23C16000LW |
| 廠商： | NEC Corp. |
| 英文描述： | 16M-Bit Mask-Programmable ROM(16M 掩膜可編程ROM) |
| 中文描述： | 1,600位掩?？删幊蘎OM（1,600掩膜可編程光盤） |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 181K |
| 代理商： | ΜPD23C16000LW |
μ
PD23C16000LW
5
Input/Output Pin Functions
Pin name
Function
WORD/BYTE
Input
The pin for switching word mode and byte mode.
High level ......... Word mode (1M-word by 16 bits)
Low level .......... Byte mode (2M-word by 8 bits)
A0 to A19
(Address input)
Address bus. A0 to A19 are used differently in the word mode (1M
-word by 16 bits) and the byte mode (2M-word by 8 bits).
Word mode....... A0 to A19 are used as 20 bits address signals.
Byte mode ........ A0 to A19 are used as the upper 20 bits of total
21 bits of address signal. (The least significant bit
(A–1) is combined to O15.)
O0 to O7, O8 to O14
(Data output)
Output
Output data bus. O0 to O7, O8 to O14 are used differently in the
word (1M-word by 16 bits) and the byte mode (2M-word by 8 bits).
Word mode....... The lower 15 bits of 16 bits data outputs to O0 to
O14. (The most significant bit (O15) combined to A–1.)
Byte mode ........ 8 bits data outputs to O0 to O7 and also O8 to O14
is high impedance.
O15/A–1
(Data output 15)/
(LSB Address input)
Output
/
Input
O15/A–1 are used differently in the word (1M-word by 16 bits) and
the byte mode (2M-word by 8 bits).
Word mode....... The most significant output data bus (O15).
Byte mode ........ The least significant address bus (A–1).
CE
(Chip Enable)
Input
Chip activating signal.
When the OE is active, output states are followings.
High level ......... High impedance
Low level .......... Data out
OE/OE/DC
(Output Enable/Don’t
care)
Output enable signal. The active level of OE is mask option. The
active level of OE can be selected from high active, low active and
Don’t care at order.
V
CC
—
Supply voltage
GND
—
Ground
NC
—
Not internally connected. (The signal can be connected.)
IC
—
Internally connected. (Leave this pin unconnected or connect to
GND.)
Input/
Output
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