MM54C923J/883B
16, 20-Key Encoder
General Description
These CMOS key encoders provide all the necessary logic
to fully encode an array of SPST switches. The keyboard
scan can be implemented by either an external clock or
external capacitor. These encoders also have on-chip pull-
up devices which permit switches with up to 50 kX on resist-
ance to be used. No diodes in the switch array are needed
to eliminate ghost switches. The internal debounce circuit
needs only a single external capacitor and can be defeated
by omitting the capacitor. A Data Available output goes to a
high level when a valid keyboard entry has been made. The
Data Available output returns to a low level when the en-
tered key is released, even if another key is depressed. The
Data Available will return high to indicate acceptance of the
new key after a normal debounce period; this two-key roll-
over is provided between any two switches.
An internal register remembers the last key pressed even
after the key is released. The TRI-STATEÉ outputs provide
for easy expansion and bus operation and are LPTTL com-
patible.
Features
50 kX maximum switch on resistance
On or off chip clock
On-chip row pull-up devices
2 key roll-over
Keybounce elimination with single capacitor
Last key register at outputs
TRI-STATE outpust LPTTL compatible
Wide supply range 3V to 15V
Low power consumption
Because of wholesale price is different from sample price, our website can not state.Please send your required part number via email to Sales@hkmjd.com or add our skype id mjdccm898 for online talking.As well as welcome you call us : 0755-83957301 We will send offer for you; Sometimes manufacturer's price is unstable, so we don't adjust price in time. if you feel price is a little high for you, just feel free to contact us for consultation. Thank you for your support ！
批发与零售价位不同,无法一一明示,详情请通过邮件或客服咨询(国内销售部电话:0755-83957301,企业QQ2850151585), 由于电子元器件价格不稳定,时常有稍许变动,本公司未能及时调整,如您觉得售价不适，请与我们说明并适当议价,谢谢支持。
