6 Apr
2007
6 Apr
'07
12:24 a.m.
Tony,
My two favorite sources for HP to JEDEC numbers;
http://home.earthlink.net/~mike.terrell/RefHPSemi.html
http://www.arrl.org/qexfiles/300-hpxref.pdf
have " holes " at your number. However, see below;
The families where the holes are tend to be 16 pin DIPs with seven NPN
transistors arranged in a common Collector arrangement ( i.e. CA3082 type ).
> Search for RCA CA3080, 3081, 3082 and also look
at 3046. RCA did a
large
number of
transistor arrays (and MOS transistor arrays).
I'm pretty sure I've checked it against all of those, and none make any
sense. Also, it's a 16 pin DIL pacakge, many of the transistor arrays
I've looked at are 14 pin DIL (or 10 / 12 lead metal cans) Here's what I've discovered so far :
Pins 2 and 4 are grounded on the PCB, and are probably the emitters of 2
transsitors
Pins 2 and 4 are the Emitters on Q2 and Q5 respectively.
Pin 3 is linked to pin 6, then pulled up by a 464R ressitor. This goes to
the input of a '14 schmitt trigger. I guess pins 3 and 6 are collectors
of transistors in the chip
Pins 3 and 6 are the Base inputs on Q2 and Q5 respectively.
Pin 16 is not connected
Pin 16 is the BASE of Q1.
Pins 7,8, 9 aren't connected either. They appear to be the 3 connections
of another transistor in the chip, with pin 89 as the base
Pins 7 and 8 are the Emitter and Base on Q6.
Pin 9 is the Emitter of Q7.
>
> The common layouts were 8 common transisters with emitter(grounded) base
> and collectors brought to pins, 8 common collector (VCC) with emitter
and
Certainly not either of those.
This one has 7 transistors as stated above, common Collector. Sounds like a
big discrete "OR " gate.
Hope this helps and I'll keep looking for any other pertinent data.
regards, Steven
> base brought to pins. Others include differential amps, darlington
arrays
and some
combination arrays. You have noticed there are a large number
of parasitic diodes as a side effect of forming the devices on one die.
Yes, and they sure make sorting out the internal configuration
non-trivial :-)
FYI here is a sample of some of the devices:
The common collector and common emitter devices were handy for LED
segment and digit drivers but were not limited to those uses.
Ca3081, ca3082 are examples of this.
FWIW, the display anode driver (segment driver) chip in the HP67
calculator is one of these. It's about the only non-custom chip you'll
find in an LED-display HP handheld calculator.
-tony