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Last update: 6 February 2005

IC number:MC68881, MC68882
IC function:Floating-point co-processor
Related components:MC68020, MC68EC020, MC68030, MC68EC030 (main processors), MC68040 (successor, on-chip math co-processor)

Component documentation
IC numberManufacturerDocumentation
MC68881Motorola (now Freescale)Web page, Programmer's Reference Manual (PDF), Programmer's Reference Manual Errata
MC68882Motorola (now Freescale)Web page, Technical Summary (PDF), Programmer's Reference Manual (PDF), Programmer's Reference Manual Errata

Component package and speed versions
IC numberPackageSpeedCBM part numberCBM part description
MC68881RC16Ceramic 68-Pin PGA 10 × 1016 MHz390277-0168881 FPU 16MHZ
MC68881FN16Plastic 68-Pin PLCC16 MHz390277-03MC68881 16 MHZ PLCC
MC68882RC25Ceramic 68-Pin PGA 10 × 1025 MHz390434-01MC68882 FPU 25MHZ
MC68882FN25Plastic 68-Pin PLCC25 MHz390434-02MC68882 25 MHZ PLCC

Positions
DevicePositionComponentPackageSpeed
A3000U101MC68881PLCC16 MHz
MC6888225 MHz
A3000TU101MC68882PLCC25 MHz
A1200U0 (not installed)PLCC
A2620U201MC68881PGA16 MHz
A2630U201MC68881PGA16 MHz
MC6888225 MHz
68020/68030 CPU card, 25 MHz 68EC030, no FPUU101 (not installed)PLCC
U104 (not installed)PGA
68020/68030 CPU card, 25 MHz, 68030, 68020, FPU, ROM ReMapU101MC68882PLCC25 MHz
U104 (not installed)PGA

Pinout 68881/68882 PGA package
PinTypeNameSignal name
GridNumberA2630
A11PowerVCCVCC
A22PowerGNDGND
A3..A43..4I/OD0..D1D0..D1
A5..A65..6I/OD3..D4D3..D4
A7..A97..9I/OD6..D8D6..D8
A1010PowerGNDGND
B111PowerVCCVCC
B2..B312..13PowerGNDGND
B414Power_SENSE_SENSE
B515I/OD2D2
B616I/OD6D6
B717PowerGNDGND
B818PowerVCCVCC
B9..B1019..20I/OD10..D11D10..D11
C121PowerGNDGND
C222InputCLKConnected to U203 or via J202, U307 and R202 to _CPUCLK
C323PowerGNDGND
C824I/OD9D9
C9..C1025..26I/OD13..D14D13..D14
D127Input_RESET_GRESET
D228PowerGNDGND
D929I/OD12D12
D1030I/OD15D15
E131N/CNCunused
E232PowerVCCVCC
E933PowerVCCVCC
E1034PowerGNDGND
F135Input_SIZEVCC via RP201
F236PowerGNDGND
F9..F1037..38I/OD17..D16D17..D16
G139Input_DS_DS
G240InputA4A4
G941I/OD20D20
G1042I/OD18D18
H143Input_AS_AS
H244InputA2A2
H345InputA0VCC via RP201
H846PowerVCCVCC
H947PowerGNDGND
H1048I/OD19D19
J149InputA3A3
J250PowerVCCVCC
J351Input_CS_FPUCS
J452Output_DSACK0_DSACK0
J553I/OD31D31
J654I/OD28D28
J755I/OD25D25
J856PowerGNDGND
J957I/OD23D23
J1058I/OD21D21
K159InputA1A1
K260InputR/_WR_W
K361PowerGNDGND
K462Output_DSACK1_DSACK1
K5..K663..64I/OD30..D29D30..D29
K7..K865..66I/OD27..D26D27..D26
K967I/OD24D24
K1068I/OD22D22

Pinout 68881/68882 PLCC package
PinTypeNameSignal name
A3000, A3000TA1200
1..3I/OD2..D0D2..D0
4Power_SENSEunused_FPU_SENSE
5..9PowerGNDGND
10PowerVCC+5VVCC
11InputCLKCLK30CPUCLK
12PowerGNDGND
13Input_RESET_FPURST_RST
14PowerGNDGND
15N/CNCunused
16Input_SIZE_FPUSIZEVCC
17PowerGNDGND
18Input_DS_DS
19Input_AS_AS
20InputA5_FPUSIZEVCC
21..26InputA4..A0A4..A0
27PowerVCC+5VVCC
28InputR/_WR_W
29Input_CS_TRUE_FPUCS_FPU_CS
30PowerGNDGND
31..32Output_DSACK0.._DSACK1_DSACK0.._DSACK1_DSACK_0.._DSACK_1
33..40I/OD31..D24D31..D24
41PowerGNDGND
42I/OD23D23
43PowerVCC+5VVCC
44..50I/OD22..D16D22..D16
51PowerGNDGND
52..53PowerVCC+5VVCC
54..60I/OD15..D9D15..D9
61PowerVCC+5VVCC
62I/OD8D8
63PowerGNDGND
64..68I/OD7..D3D7..D3

Copyright © 2002-2005 Ronald van Dijk - All rights reserved