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VK3EUB > TECH 06.08.04 12:29l 102 Lines 3613 Bytes #999 (0) @ WW
BID : 204_VK3EUB
Read: GUEST
Subj: Re: Prom info required
Path: DB0FHN<DB0FOR<DB0MRW<DB0RGB<OK0PPL<DB0RES<ON0AR<WB0TAX<ZL2TZE<W4JAX<
VK4TRS<VK3AYM<VK3APC
Sent: 040806/0336Z @:VK3APC.#MEL.VIC.AUS.OC #:25945 XFBB7.03 Bid:204_VK3EUB
From: VK3EUB@VK3APC.#MEL.VIC.AUS.OC
To : TECH@WW
VK3EUB/TPK 1.83e Msg #:204 Local Date: 06-08-2004 Time: 1:18 PM (03:18 UTC)
From : VK3EUB@VK3APC.#MEL.VIC.AUS.OC
To : TECH@WW
The following instructions are from project 688 published in
ETI (Electronics Today International) which was and Australian
publication.
Progammer for Fusible-Link bipolar Proms
By Chuck Simmers Field Applications Engineer, Intel Corp, NSW
In order to generate a high level on the outputs, the Prom must
be programmed in the following manner:
1. Address/inputs and chip-enable pins must be driven from
normal TTL logic levels during both programming and verification.
2. Programming will occur at a selected address when Vcc is held at
10.5 V, the appropriate output is held at 10.5 V, and the chip is
enabled. To achieve these conditions and the appropriate sequence,
the following procedure must be followed:
a. Select the desired word by applying a high or low level to the
address/inputs. Disable the chip by taking the enable input to a
high level.
b. Increase Vcc to 10.5 V. Since Vcc supplies the current to program
the fuse as well as the Icc of the device at programming voltage,
it must be capable of supplying 750 ma at 11.0 V
c. Select the output where a high level is desired by raising that
output pin to 10.5 V. It is critical that only one output at a
time be programmed since the internal circuitry can only supply
programming current to one bit at a time. Outputs not being
programmed must be left floating or tied to a high impedance
source of at least 20 K Ohm.
d. Enable the device by taking the chip enable to a low level for
a duration of 10 us.
e. Verify that the bit is programmed by first removing the programming
voltage of 10.5 V and returning Vcc to 5 V. The chip must be enabled
to sense the states of the outputs. Steps b, c, d are repeated
about 10 times or until the output is verified.
f. Following verification, apply about 5 more programming pulses to
the bit to ensure that the fuse is completely blown.
g. Repeat steps a through f for each bit to be programmed to a high
level. After all selected bits are programmed, verification of
the entire contents of the memory should be performed.
Then follows with a list of IC's which does not include the one's
you want.
74S188 22 ns National Semi
74S288 22 ns N S
77S188 12 ns N S
77S288 12 ns N S
27S18 AMD
27S19 AMD
6330-1 MMI
6331-1 MMI
82S23 Signetics
82S123 Signetics
Brian VK3EUB
>From: ZS1AYJ@ZS0STB.TBG.WCP.ZAF.AF
>To : TECH@WW
>
>
>Hi All
>
>I am trying to find any information regarding the programming procedure
>for the old 74S287 / 82S129 fusable proms. I need to know the programming
>sequence / timing / voltage & current limit etc in enough detail to enable
>me to build a hardware programmer.
>
>If you have a fairly ancient TTL Databook gathering dust somewhere would
>you check if the above devices are listed and if the datasheet has any of
>this information ?
>
>Any information will be greatly appreciated.
>
> --oOo--
>
> 73 - Terry,
> Durbanville JF96HD
> Cape Town, South Africa
> ZSAYJ @ ZS0STB.TBG.WCP.ZAF.AF
> zs1ayj@qsl.net
> Message timed: 11:56 on 2004-Aug-04
> Message sent using WinPack V6.80 & AGW 2002.308
>
> --oOo--
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