Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 662-9556
製造零件編號CD40192BE
HK$3.84
/個 (每包:5個)
單位
PDIP Counter 4 4000 Through Hole Decade Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 662-8130
製造零件編號SN74HC166DR
HK$2.87
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 756-2827
製造零件編號TC4094BF(EL,N,F)
BrandToshiba
HK$10.68
/個 (每包:5個)
單位
SOP Shift Register 8 CMOS Surface Mount - Serial/Parallel 1 16 3 V 18 V 10.8 x 5.3 x 1.5mm 10.8mm 5.3mm
RS庫存編號 170-8025
製造零件編號74HC4040D,653
BrandNexperia
HK$1.188
個 (在毎卷:2500)
單位
SO Counter 12 74HC Surface Mount Binary - 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 146-0373
製造零件編號74HC390D,652
BrandNexperia
HK$2.137
毎管:50 個
單位
SOIC Counter - 74HC Surface Mount Decade Up Counter 2 16 2 V 6 V 10 x 4 x 1.45mm 10mm 3.9mm
RS庫存編號 171-3445
製造零件編號74VHC595FT
BrandToshiba
HK$1.613
/個 (每包:50個)
單位
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 162-6977
製造零件編號CD74HCT40103M96
HK$5.23
個 (在毎卷:2500)
單位
SOIC Counter 8 HCT Surface Mount Binary Down Counter 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
全新
RS庫存編號 186-9081
製造零件編號MC14021BDR2G
HK$1.301
個 (在毎卷:2500)
單位
SOIC Shift Register 8 - Surface Mount - Parallel to Serial - 16 3 V dc 18 V dc 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 121-9068
製造零件編號TPIC6B596N
HK$10.01
毎管:20 個
單位
PDIP Shift Register 8 - Through Hole - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 24.33 x 6.35 x 4.57mm 24.33mm 6.35mm
RS庫存編號 663-2098
製造零件編號SN74HC393D
HK$3.722
/個 (每包:10個)
單位
SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 122-2837
製造零件編號74HCT595S16-13
HK$1.199
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HCT Surface Mount Octal Serial to Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 145-0870
製造零件編號CD74HC4040M
HK$3.994
毎管:40 個
單位
SOIC Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 145-0173
製造零件編號SN74HC393D
HK$2.875
毎管:50 個
單位
SOIC Counter, Divider 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 121-8422
製造零件編號TPIC6595DW
HK$21.332
毎管:25 個
單位
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS庫存編號 663-2701
製造零件編號SN74LV164AD
HK$1.771
/個 (每包:10個)
單位
SOIC Shift Register 8 LV Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 170-5422
製造零件編號74HC4094PW,118
BrandNexperia
HK$2.829
/個 (每包:25個)
單位
TSSOP Shift Register 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 144-9944
製造零件編號CD74HC165E
HK$3.269
毎管:25 個
單位
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 171-3351
製造零件編號74VHC595FT
BrandToshiba
HK$0.974
個 (在毎卷:2500)
單位
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 178-4717
製造零件編號MC74HC589ADG
HK$2.605
毎管:48 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 163-0600
製造零件編號MC74HC4060ADTR2G
HK$1.801
個 (在毎卷:2500)
單位
TSSOP Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm