Philips Semiconductors Product specification
74F821/822/823/824/825/826Bus interface registers
2
1996 Jan 05 853-1304 16195
74F821 10-bit bus interface register, non-inverting (3-State)
74F822 10-bit bus interface register, inverting (3-State)
74F823 9-bit bus interface register, non-inverting (3-State)
74F824 9-bit bus interface register, inverting (3-State)
74F825 8-bit bus interface register, non-inverting (3-State)
74F826 8-bit bus interface register, inverting (3-State)
FEATURES
• High speed parallel registers with positive edge-triggered D-type
flip-flops
• High performance bus interface buffering for wide data/address
paths or busses carrying parity
• High impedance PNP base inputs for reduced loading (20µA in
high and low states)
• I
IL
is 20µA vs 1000µA for AM29821 series
• Buffered control inputs to reduce AC effects
• Ideal where high speed, light loading, or increased fan-in as
required with MOS microprocessor
• Positive and negative over-shoots are clamped to ground
• 3-State outputs glitch free during power-up and power-down
• Slim Dip 300 mil package
• Broadside pinout compatible with AMD AM 29821-29826 series
• Outputs sink 64mA and source 24mA
• Industrial temperature range available (–40°C to +85°C) for
74F823
DESCRIPTION
The 74F821 series bus interface registers are designed to
eliminate the extra packages required to buffer existing registers and
provide extra data width for wider data/address paths of busses
carrying parity.
The 74F821/74F822 are buffered 10-bit wide versions of the popular
74F374/74F534 functions.
The 74F822 is the inverted output version of 74F821.
The 74F823 and 74F824 are 9-bit wide buffered registers with clock
enable (CE
) and master reset (MR) which are ideal for parity bus
interfacing in high microprogrammed systems.
The 74F824 is the inverted version of 74F823.
The 74F825 and 74F826 are 8-bit buffered registers with all the
74F823/74F824 controls plus output enable (OE
0, OE1, OE2) to
allow multiuser control of the interface, e.g., CS
, DMA, and RD/WR.
They are ideal for uses as an output port requiring high I
OL
/I
OH
.
The 74F826 is the inverted version of 74F825.
TYPE
TYPICAL
f
max
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F821, 74F822 180MHz 75mA
74F823, 74F824 180MHz 70mA
74F825, 74F826 180MHz 65mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
INDUSTRIAL RANGE
V
CC
= 5V ±10%,
T
amb
= –40°C to +85°C
PKG. DWG. #
24-pin plastic slim DIP (300mil)
N74F821N, N74F822N, N74F823N,
N74F824N, N74F825N, N74F826N
I74F823N SOT222-1
24-pin plastic SOL
N74F821D, N74F822D, N74F823D,
N74F824D, N74F825D, N74F826D
I74F823D SOT137-1
