IC- Types A...

AM25LS2521 Eight Bit Equal-to Comparator

2 inputs for 8-bit words with provision for expansion or
 external enabling.

The matching of the two words plus a logic LOW on the /E input
 produces an active LOW at the Output.

Pins :
1 : /E
2 : A0
3 : B0
4 : A1
5 : B1
6 : A2
7 : B2
8 : A3
9 : B3
10: Gnd
11: A4
12: B4
13: A5
14: B5
15: A6
16: B6
17: A7
18: B7
19: Output
20: Vcc

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Without guaranty! Mistakes are possible. Please ask via email if you find a strange value!

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AM25LS2537 One-of-Ten Decoder with
 Three-State Outputs and Polarity Control:

Pins :
1 : Y2
2 : Y1
3 : Y0
4 : POL Polarity input, if HIGH,the outputs are active-LOW
5 : /OE
6 : A input
7 : B
8 : Y5
9 : Y6
10: Gnd
11: Y7
12: Y8
13: Y9
14: E2
15: /E1
16: C
17: D
18: Y4
19: Y3
20: Vcc

For /OE=L, /E1=L, E2=H :
D  C  B  A    Y0  Y1  Y2 ..... Y9 (for POL = L:)

L  L  L  L    H   L   L        L
L  L  L  H    L   H   L        L
L  L  H  L    L   L   H        L
.....
H  L  L  H    L   L   L        H
L  H  L  L    L   L   L        L
.....
H  H  H  H    L   L   L        L

All other combinations of /OE, /E1, E2 : Disable

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Without guaranty! Mistakes are possible. Please ask via email if you find a strange value!

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AT38H256-20...
I have the datasheet in a databook ATMEL 1993

Pins:
1  : A14
2  : A12
3  : A7
4  : A6
5  : A5
4  : A4
7  : A3
8  : A2
9  : A1
10 : A0
11 : Q1
12 : Q2
13 : Q3
14 : Gnd
15 : Q4
16 : Q5
17 : Q6
18 : Q7
19 : Q8
20 : /CE
21 : A10
22 : /OE
23 : A11
24 : A9
25 : A8
26 : A13
27 : /WE
28 : Vcc

Code for Package:
AT38H256-20Nc :Plastic DIL 0.3"wide = 7.6 to 8.3mm
...Xc : SOIC J-Leaded, pitch 1.27mm 
         (max 8.8mm wide,18.1 mm long)

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Without guaranty! Mistakes are possible. Please ask via email if you find a strange value!

__________________________________

Alle Angaben ohne Garantie. Fehler beim Abschreiben sind möglich. Wenn Sie seltsame Werte entdecken, scheuen Sie sich nicht, per email nachzufragen!

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